/*
* 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.
*
* $Id$
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/sched.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/auth.h>
#include <linux/sunrpc/auth_gss.h>
#include <linux/sunrpc/svcauth_gss.h>
#include <linux/sunrpc/gss_err.h>
#include <linux/workqueue.h>
#include <linux/sunrpc/rpc_pipe_fs.h>
#include <linux/sunrpc/gss_api.h>
#include <asm/uaccess.h>
static struct rpc_authops authgss_ops;
static struct rpc_credops gss_credops;
#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_AUTH
#endif
#define NFS_NGROUPS 16
#define GSS_CRED_EXPIRE (60 * HZ) /* XXX: reasonable? */
#define GSS_CRED_SLACK 1024 /* XXX: unused */
/* length of a krb5 verifier (48), plus data added before arguments when
* using integrity (two 4-byte integers): */
#define GSS_VERF_SLACK 56
/* XXX this define must match the gssd define
* as it is passed to gssd to signal the use of
* machine creds should be part of the shared rpc interface */
#define CA_RUN_AS_MACHINE 0x00000200
/* dump the buffer in `emacs-hexl' style */
#define isprint(c) ((c > 0x1f) && (c < 0x7f))
static rwlock_t gss_ctx_lock = RW_LOCK_UNLOCKED;
struct gss_auth {
struct rpc_auth rpc_auth;
struct gss_api_mech *mech;
struct list_head upcalls;
struct dentry *dentry;
char path[48];
spinlock_t lock;
};
static void gss_destroy_ctx(struct gss_cl_ctx *);
static struct rpc_pipe_ops gss_upcall_ops;
void
print_hexl(u32 *p, u_int length, u_int offset)
{
u_int i, j, jm;
u8 c, *cp;
dprintk("RPC: print_hexl: length %d\n",length);
dprintk("\n");
cp = (u8 *) p;
for (i = 0; i < length; i += 0x10) {
dprintk(" %04x: ", (u_int)(i + offset));
jm = length - i;
jm = jm > 16 ? 16 : jm;
for (j = 0; j < jm; j++) {
if ((j % 2) == 1)
dprintk("%02x ", (u_int)cp[i+j]);
else
dprintk("%02x", (u_int)cp[i+j]);
}
for (; j < 16; j++) {
if ((j % 2) == 1)
dprintk(" ");
else
dprintk(" ");
}
dprintk(" ");
for (j = 0; j < jm; j++) {
c = cp[i+j];
c = isprint(c) ? c : '.';
dprintk("%c", c);
}
dprintk("\n");
}
}
EXPORT_SYMBOL(print_hexl);
static inline struct gss_cl_ctx *
gss_get_ctx(struct gss_cl_ctx *ctx)
{
atomic_inc(&ctx->count);
return ctx;
}
static inline void
gss_put_ctx(struct gss_cl_ctx *ctx)
{
if (atomic_dec_and_test(&ctx->count))
gss_destroy_ctx(ctx);
}
static void
gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
{
struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
struct gss_cl_ctx *old;
write_lock(&gss_ctx_lock);
old = gss_cred->gc_ctx;
gss_cred->gc_ctx = ctx;
cred->cr_flags |= RPCAUTH_CRED_UPTODATE;
write_unlock(&gss_ctx_lock);
if (old)
gss_put_ctx(old);
}
static int
gss_cred_is_uptodate_ctx(struct rpc_cred *cred)
{
struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
int res = 0;
read_lock(&gss_ctx_lock);
if ((cred->cr_flags & RPCAUTH_CRED_UPTODATE) && gss_cred->gc_ctx)
res = 1;
read_unlock(&gss_ctx_lock);
return res;
}
static inline int
simple_get_bytes(char **ptr, const char *end, void *res, int len)
{
char *p, *q;
p = *ptr;
q = p + len;
if (q > end || q < p)
return -1;
memcpy(res, p, len);
*ptr = q;
return 0;
}
static inline int
simple_get_netobj(char **ptr, const char *end, struct xdr_netobj *res)
{
char *p, *q;
p = *ptr;
if (simple_get_bytes(&p, end, &res->len, sizeof(res->len)))
return -1;
q = p + res->len;
if (q > end || q < p)
return -1;
res->data = p;
*ptr = q;
return 0;
}
static int
dup_netobj(struct xdr_netobj *source, struct xdr_netobj *dest)
{
dest->len = source->len;
if (!(dest->data = kmalloc(dest->len, GFP_KERNEL)))
return -1;
memcpy(dest->data, source->data, dest->len);
return 0;
}
static struct gss_cl_ctx *
gss_cred_get_ctx(struct rpc_cred *cred)
{
struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
struct gss_cl_ctx *ctx = NULL;
read_lock(&gss_ctx_lock);
if (gss_cred->gc_ctx)
ctx = gss_get_ctx(gss_cred->gc_ctx);
read_unlock(&gss_ctx_lock);
return ctx;
}
static int
gss_parse_init_downcall(struct gss_api_mech *gm, struct xdr_netobj *buf,
struct gss_cl_ctx **gc, uid_t *uid, int *gss_err)
{
char *end = buf->data + buf->len;
char *p = buf->data;
struct gss_cl_ctx *ctx;
struct xdr_netobj tmp_buf;
unsigned int timeout;
int err = -EIO;
if (!(ctx = kmalloc(sizeof(*ctx), GFP_KERNEL))) {
err = -ENOMEM;
goto err;
}
ctx->gc_proc = RPC_GSS_PROC_DATA;
ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */
spin_lock_init(&ctx->gc_seq_lock);
atomic_set(&ctx->count,1);
if (simple_get_bytes(&p, end, uid, sizeof(*uid)))
goto err_free_ctx;
/* FIXME: discarded timeout for now */
if (simple_get_bytes(&p, end, &timeout, sizeof(timeout)))
goto err_free_ctx;
*gss_err = 0;
if (simple_get_bytes(&p, end, &ctx->gc_win, sizeof(ctx->gc_win)))
goto err_free_ctx;
/* gssd signals an error by passing ctx->gc_win = 0: */
if (!ctx->gc_win) {
/* in which case the next int is an error code: */
if (simple_get_bytes(&p, end, gss_err, sizeof(*gss_err)))
goto err_free_ctx;
err = 0;
goto err_free_ctx;
}
if (simple_get_netobj(&p, end, &tmp_buf))
goto err_free_ctx;
if (dup_netobj(&tmp_buf, &ctx->gc_wire_ctx)) {
err = -ENOMEM;
goto err_free_ctx;
}
if (simple_get_netobj(&p, end, &tmp_buf))
goto err_free_wire_ctx;
if (p != end)
goto err_free_wire_ctx;
if (gss_import_sec_context(&tmp_buf, gm, &ctx->gc_gss_ctx))
goto err_free_wire_ctx;
*gc = ctx;
return 0;
err_free_wire_ctx:
kfree(ctx->gc_wire_ctx.data);
err_free_ctx:
kfree(ctx);
err:
*gc = NULL;
dprintk("RPC: gss_parse_init_downcall returning %d\n", err);
return err;
}
struct gss_upcall_msg {
struct rpc_pipe_msg msg;
struct list_head list;
struct gss_auth *auth;
struct rpc_wait_queue waitq;
uid_t uid;
atomic_t count;
};
static void
gss_release_msg(struct gss_upcall_msg *gss_msg)
{
if (!atomic_dec_and_test(&gss_msg->count))
return;
BUG_ON(!list_empty(&gss_msg->list));
kfree(gss_msg);
}
static struct gss_upcall_msg *
__gss_find_upcall(struct gss_auth *gss_auth, uid_t uid)
{
struct gss_upcall_msg *pos;
list_for_each_entry(pos, &gss_auth->upcalls, list) {
if (pos->uid != uid)
continue;
atomic_inc(&pos->count);
dprintk("RPC: gss_find_upcall found msg %p\n", pos);
return pos;
}
dprintk("RPC: gss_find_upcall found nothing\n");
return NULL;
}
static void
__gss_unhash_msg(struct gss_upcall_msg *gss_msg)
{
if (list_empty(&gss_msg->list))
return;
list_del_init(&gss_msg->list);
if (gss_msg->msg.errno < 0)
rpc_wake_up_status(&gss_msg->waitq, gss_msg->msg.errno);
else
rpc_wake_up(&gss_msg->waitq);
atomic_dec(&gss_msg->count);
}
static void
gss_unhash_msg(struct gss_upcall_msg *gss_msg)
{
struct gss_auth *gss_auth = gss_msg->auth;
spin_lock(&gss_auth->lock);
__gss_unhash_msg(gss_msg);
spin_unlock(&gss_auth->lock);
}
static int
gss_upcall(struct rpc_clnt *clnt, struct rpc_task *task, struct rpc_cred *cred)
{
struct gss_auth *gss_auth = container_of(clnt->cl_auth,
struct gss_auth, rpc_auth);
struct gss_upcall_msg *gss_msg, *gss_new = NULL;
struct rpc_pipe_msg *msg;
struct dentry *dentry = gss_auth->dentry;
uid_t uid = cred->cr_uid;
int res = 0;
dprintk("RPC: %4u gss_upcall for uid %u\n", task->tk_pid, uid);
retry:
spin_lock(&gss_auth->lock);
gss_msg = __gss_find_upcall(gss_auth, uid);
if (gss_msg)
goto out_sleep;
if (gss_new == NULL) {
spin_unlock(&gss_auth->lock);
gss_new = kmalloc(sizeof(*gss_new), GFP_KERNEL);
if (!gss_new) {
dprintk("RPC: %4u gss_upcall -ENOMEM\n", task->tk_pid);
return -ENOMEM;
}
goto retry;
}
gss_msg = gss_new;
memset(gss_new, 0, sizeof(*gss_new));
INIT_LIST_HEAD(&gss_new->list);
rpc_init_wait_queue(&gss_new->waitq, "RPCSEC_GSS upcall waitq");
atomic_set(&gss_new->count, 2);
msg = &gss_new->msg;
msg->data = &gss_new->uid;
msg->len = sizeof(gss_new->uid);
gss_new->uid = uid;
gss_new->auth = gss_auth;
list_add(&gss_new->list, &gss_auth->upcalls);
gss_new = NULL;
/* Has someone updated the credential behind our back? */
if (!gss_cred_is_uptodate_ctx(cred)) {
/* No, so do upcall and sleep */
task->tk_timeout = 0;
rpc_sleep_on(&gss_msg->waitq, task, NULL, NULL);
spin_unlock(&gss_auth->lock);
res = rpc_queue_upcall(dentry->d_inode, msg);
if (res)
gss_unhash_msg(gss_msg);
} else {
/* Yes, so cancel upcall */
__gss_unhash_msg(gss_msg);
spin_unlock(&gss_auth->lock);
}
gss_release_msg(gss_msg);
dprintk("RPC: %4u gss_upcall for uid %u result %d\n", task->tk_pid,
uid, res);
return res;
out_sleep:
task->tk_timeout = 0;
rpc_sleep_on(&gss_msg->waitq, task, NULL, NULL);
spin_unlock(&gss_auth->lock);
dprintk("RPC: %4u gss_upcall sleeping\n", task->tk_pid);
if (gss_new)
kfree(gss_new);
/* Note: we drop the reference here: we are automatically removed
* from the queue when we're woken up, and we should in any case
* have no further responsabilities w.r.t. the upcall.
*/
gss_release_msg(gss_msg);
return 0;
}
static ssize_t
gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
char __user *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;
}
#define MSG_BUF_MAXSIZE 1024
static ssize_t
gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
{
struct xdr_netobj obj = {
.len = mlen,
};
struct inode *inode = filp->f_dentry->d_inode;
struct rpc_inode *rpci = RPC_I(inode);
struct rpc_clnt *clnt;
struct rpc_auth *auth;
struct gss_auth *gss_auth;
struct gss_api_mech *mech;
struct auth_cred acred = { 0 };
struct rpc_cred *cred;
struct gss_upcall_msg *gss_msg;
struct gss_cl_ctx *ctx = NULL;
ssize_t left;
int err;
int gss_err;
if (mlen > MSG_BUF_MAXSIZE)
return -EFBIG;
obj.data = kmalloc(mlen, GFP_KERNEL);
if (!obj.data)
return -ENOMEM;
left = copy_from_user(obj.data, src, mlen);
if (left) {
err = -EFAULT;
goto out;
}
clnt = rpci->private;
atomic_inc(&clnt->cl_users);
auth = clnt->cl_auth;
gss_auth = container_of(auth, struct gss_auth, rpc_auth);
mech = gss_auth->mech;
err = gss_parse_init_downcall(mech, &obj, &ctx, &acred.uid, &gss_err);
if (err)
goto err;
cred = rpcauth_lookup_credcache(auth, &acred, 0);
if (!cred)
goto err;
if (gss_err)
cred->cr_flags |= RPCAUTH_CRED_DEAD;
else
gss_cred_set_ctx(cred, ctx);
spin_lock(&gss_auth->lock);
gss_msg = __gss_find_upcall(gss_auth, acred.uid);
if (gss_msg) {
__gss_unhash_msg(gss_msg);
spin_unlock(&gss_auth->lock);
gss_release_msg(gss_msg);
} else
spin_unlock(&gss_auth->lock);
rpc_release_client(clnt);
kfree(obj.data);
dprintk("RPC: gss_pipe_downcall returning length %Zu\n", mlen);
return mlen;
err:
if (ctx)
gss_destroy_ctx(ctx);
rpc_release_client(clnt);
out:
kfree(obj.data);
dprintk("RPC: gss_pipe_downcall returning %d\n", err);
return err;
}
static void
gss_pipe_release(struct inode *inode)
{
struct rpc_inode *rpci = RPC_I(inode);
struct rpc_clnt *clnt;
struct rpc_auth *auth;
struct gss_auth *gss_auth;
clnt = rpci->private;
auth = clnt->cl_auth;
gss_auth = container_of(auth, struct gss_auth, rpc_auth);
spin_lock(&gss_auth->lock);
while (!list_empty(&gss_auth->upcalls)) {
struct gss_upcall_msg *gss_msg;
gss_msg = list_entry(gss_auth->upcalls.next,
struct gss_upcall_msg, list);
gss_msg->msg.errno = -EPIPE;
atomic_inc(&gss_msg->count);
__gss_unhash_msg(gss_msg);
spin_unlock(&gss_auth->lock);
gss_release_msg(gss_msg);
spin_lock(&gss_auth->lock);
}
spin_unlock(&gss_auth->lock);
}
void
gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
{
struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
static unsigned long ratelimit;
if (msg->errno < 0) {
dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n",
gss_msg);
atomic_inc(&gss_msg->count);
gss_unhash_msg(gss_msg);
if (msg->errno == -ETIMEDOUT || msg->errno == -EPIPE) {
unsigned long now = jiffies;
if (time_after(now, ratelimit)) {
printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n"
"Please check user daemon is running!\n");
ratelimit = now + 15*HZ;
}
}
gss_release_msg(gss_msg);
}
}
/*
* NOTE: we have the opportunity to use different
* parameters based on the input flavor (which must be a pseudoflavor)
*/
static struct rpc_auth *
gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
{
struct gss_auth *gss_auth;
struct rpc_auth * auth;
dprintk("RPC: creating GSS authenticator for client %p\n",clnt);
if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
goto out_dec;
gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
if (!gss_auth->mech) {
printk(KERN_WARNING "%s: Pseudoflavor %d not found!",
__FUNCTION__, flavor);
goto err_free;
}
INIT_LIST_HEAD(&gss_auth->upcalls);
spin_lock_init(&gss_auth->lock);
auth = &gss_auth->rpc_auth;
auth->au_cslack = GSS_CRED_SLACK >> 2;
auth->au_rslack = GSS_VERF_SLACK >> 2;
auth->au_expire = GSS_CRED_EXPIRE;
auth->au_ops = &authgss_ops;
auth->au_flavor = flavor;
rpcauth_init_credcache(auth);
snprintf(gss_auth->path, sizeof(gss_auth->path), "%s/%s",
clnt->cl_pathname,
gss_auth->mech->gm_name);
gss_auth->dentry = rpc_mkpipe(gss_auth->path, clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
if (IS_ERR(gss_auth->dentry))
goto err_free;
return auth;
err_free:
kfree(gss_auth);
out_dec:
return NULL;
}
static void
gss_destroy(struct rpc_auth *auth)
{
struct gss_auth *gss_auth;
dprintk("RPC: destroying GSS authenticator %p flavor %d\n",
auth, auth->au_flavor);
gss_auth = container_of(auth, struct gss_auth, rpc_auth);
rpc_unlink(gss_auth->path);
rpcauth_free_credcache(auth);
}
/* gss_destroy_cred (and gss_destroy_ctx) are used to clean up after failure
* to create a new cred or context, so they check that things have been
* allocated before freeing them. */
static void
gss_destroy_ctx(struct gss_cl_ctx *ctx)
{
dprintk("RPC: gss_destroy_ctx\n");
if (ctx->gc_gss_ctx)
gss_delete_sec_context(&ctx->gc_gss_ctx);
if (ctx->gc_wire_ctx.len > 0) {
kfree(ctx->gc_wire_ctx.data);
ctx->gc_wire_ctx.len = 0;
}
kfree(ctx);
}
static void
gss_destroy_cred(struct rpc_cred *rc)
{
struct gss_cred *cred = (struct gss_cred *)rc;
dprintk("RPC: gss_destroy_cred \n");
if (cred->gc_ctx)
gss_put_ctx(cred->gc_ctx);
kfree(cred);
}
static struct rpc_cred *
gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int taskflags)
{
struct gss_cred *cred = NULL;
dprintk("RPC: gss_create_cred for uid %d, flavor %d\n",
acred->uid, auth->au_flavor);
if (!(cred = kmalloc(sizeof(*cred), GFP_KERNEL)))
goto out_err;
memset(cred, 0, sizeof(*cred));
atomic_set(&cred->gc_count, 0);
cred->gc_uid = acred->uid;
/*
* Note: in order to force a call to call_refresh(), we deliberately
* fail to flag the credential as RPCAUTH_CRED_UPTODATE.
*/
cred->gc_flags = 0;
cred->gc_base.cr_ops = &gss_credops;
cred->gc_flavor = auth->au_flavor;
return (struct rpc_cred *) cred;
out_err:
dprintk("RPC: gss_create_cred failed\n");
if (cred) gss_destroy_cred((struct rpc_cred *)cred);
return NULL;
}
static int
gss_match(struct auth_cred *acred, struct rpc_cred *rc, int taskflags)
{
return (rc->cr_uid == acred->uid);
}
/*
* Marshal credentials.
* Maybe we should keep a cached credential for performance reasons.
*/
static u32 *
gss_marshal(struct rpc_task *task, u32 *p, int ruid)
{
struct rpc_cred *cred = task->tk_msg.rpc_cred;
struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
gc_base);
struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
u32 *cred_len;
struct rpc_rqst *req = task->tk_rqstp;
u32 maj_stat = 0;
struct xdr_netobj mic;
struct kvec iov;
struct xdr_buf verf_buf;
u32 service;
dprintk("RPC: %4u gss_marshal\n", task->tk_pid);
*p++ = htonl(RPC_AUTH_GSS);
cred_len = p++;
service = gss_pseudoflavor_to_service(ctx->gc_gss_ctx->mech_type,
gss_cred->gc_flavor);
if (service == 0) {
dprintk("RPC: %4u Bad pseudoflavor %d in gss_marshal\n",
task->tk_pid, gss_cred->gc_flavor);
goto out_put_ctx;
}
spin_lock(&ctx->gc_seq_lock);
req->rq_seqno = ctx->gc_seq++;
spin_unlock(&ctx->gc_seq_lock);
*p++ = htonl((u32) RPC_GSS_VERSION);
*p++ = htonl((u32) ctx->gc_proc);
*p++ = htonl((u32) req->rq_seqno);
*p++ = htonl((u32) service);
p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
*cred_len = htonl((p - (cred_len + 1)) << 2);
/* We compute the checksum for the verifier over the xdr-encoded bytes
* starting with the xid and ending at the end of the credential: */
iov.iov_base = req->rq_snd_buf.head[0].iov_base;
if (task->tk_client->cl_xprt->stream)
/* See clnt.c:call_header() */
iov.iov_base += 4;
iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
xdr_buf_from_iov(&iov, &verf_buf);
/* set verifier flavor*/
*p++ = htonl(RPC_AUTH_GSS);
mic.data = (u8 *)(p + 1);
maj_stat = gss_get_mic(ctx->gc_gss_ctx,
GSS_C_QOP_DEFAULT,
&verf_buf, &mic);
if(maj_stat != 0){
printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
goto out_put_ctx;
}
p = xdr_encode_opaque(p, NULL, mic.len);
gss_put_ctx(ctx);
return p;
out_put_ctx:
gss_put_ctx(ctx);
return NULL;
}
/*
* Refresh credentials. XXX - finish
*/
static int
gss_refresh(struct rpc_task *task)
{
struct rpc_clnt *clnt = task->tk_client;
struct rpc_cred *cred = task->tk_msg.rpc_cred;
if (!gss_cred_is_uptodate_ctx(cred))
return gss_upcall(clnt, task, cred);
return 0;
}
static u32 *
gss_validate(struct rpc_task *task, u32 *p)
{
struct rpc_cred *cred = task->tk_msg.rpc_cred;
struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
gc_base);
struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
u32 seq, qop_state;
struct kvec iov;
struct xdr_buf verf_buf;
struct xdr_netobj mic;
u32 flav,len;
u32 service;
dprintk("RPC: %4u gss_validate\n", task->tk_pid);
flav = ntohl(*p++);
if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
goto out_bad;
if (flav != RPC_AUTH_GSS)
goto out_bad;
seq = htonl(task->tk_rqstp->rq_seqno);
iov.iov_base = &seq;
iov.iov_len = sizeof(seq);
xdr_buf_from_iov(&iov, &verf_buf);
mic.data = (u8 *)p;
mic.len = len;
if (gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic, &qop_state))
goto out_bad;
service = gss_pseudoflavor_to_service(ctx->gc_gss_ctx->mech_type,
gss_cred->gc_flavor);
switch (service) {
case RPC_GSS_SVC_NONE:
/* verifier data, flavor, length: */
task->tk_auth->au_rslack = XDR_QUADLEN(len) + 2;
break;
case RPC_GSS_SVC_INTEGRITY:
/* verifier data, flavor, length, length, sequence number: */
task->tk_auth->au_rslack = XDR_QUADLEN(len) + 4;
break;
default:
goto out_bad;
}
gss_put_ctx(ctx);
dprintk("RPC: %4u GSS gss_validate: gss_verify_mic succeeded.\n",
task->tk_pid);
return p + XDR_QUADLEN(len);
out_bad:
gss_put_ctx(ctx);
dprintk("RPC: %4u gss_validate failed.\n", task->tk_pid);
return NULL;
}
static inline int
gss_wrap_req_integ(struct gss_cl_ctx *ctx,
kxdrproc_t encode, void *rqstp, u32 *p, void *obj)
{
struct rpc_rqst *req = (struct rpc_rqst *)rqstp;
struct xdr_buf *snd_buf = &req->rq_snd_buf;
struct xdr_buf integ_buf;
u32 *integ_len = NULL;
struct xdr_netobj mic;
u32 offset, *q;
struct kvec *iov;
u32 maj_stat = 0;
int status = -EIO;
integ_len = p++;
offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
*p++ = htonl(req->rq_seqno);
status = encode(rqstp, p, obj);
if (status)
return status;
if (xdr_buf_subsegment(snd_buf, &integ_buf,
offset, snd_buf->len - offset))
return status;
*integ_len = htonl(integ_buf.len);
/* guess whether we're in the head or the tail: */
if (snd_buf->page_len || snd_buf->tail[0].iov_len)
iov = snd_buf->tail;
else
iov = snd_buf->head;
p = iov->iov_base + iov->iov_len;
mic.data = (u8 *)(p + 1);
maj_stat = gss_get_mic(ctx->gc_gss_ctx,
GSS_C_QOP_DEFAULT, &integ_buf, &mic);
status = -EIO; /* XXX? */
if (maj_stat)
return status;
q = xdr_encode_opaque(p, NULL, mic.len);
offset = (u8 *)q - (u8 *)p;
iov->iov_len += offset;
snd_buf->len += offset;
return 0;
}
static int
gss_wrap_req(struct rpc_task *task,
kxdrproc_t encode, void *rqstp, u32 *p, void *obj)
{
struct rpc_cred *cred = task->tk_msg.rpc_cred;
struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
gc_base);
struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
int status = -EIO;
u32 service;
dprintk("RPC: %4u gss_wrap_req\n", task->tk_pid);
if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
/* The spec seems a little ambiguous here, but I think that not
* wrapping context destruction requests makes the most sense.
*/
status = encode(rqstp, p, obj);
goto out;
}
service = gss_pseudoflavor_to_service(ctx->gc_gss_ctx->mech_type,
gss_cred->gc_flavor);
switch (service) {
case RPC_GSS_SVC_NONE:
status = encode(rqstp, p, obj);
goto out;
case RPC_GSS_SVC_INTEGRITY:
status = gss_wrap_req_integ(ctx, encode, rqstp, p, obj);
goto out;
case RPC_GSS_SVC_PRIVACY:
default:
goto out;
}
out:
gss_put_ctx(ctx);
dprintk("RPC: %4u gss_wrap_req returning %d\n", task->tk_pid, status);
return status;
}
static inline int
gss_unwrap_resp_integ(struct gss_cl_ctx *ctx,
kxdrproc_t decode, void *rqstp, u32 **p, void *obj)
{
struct rpc_rqst *req = (struct rpc_rqst *)rqstp;
struct xdr_buf *rcv_buf = &req->rq_rcv_buf;
struct xdr_buf integ_buf;
struct xdr_netobj mic;
u32 data_offset, mic_offset;
u32 integ_len;
u32 maj_stat;
int status = -EIO;
integ_len = ntohl(*(*p)++);
if (integ_len & 3)
return status;
data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
mic_offset = integ_len + data_offset;
if (mic_offset > rcv_buf->len)
return status;
if (ntohl(*(*p)++) != req->rq_seqno)
return status;
if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset,
mic_offset - data_offset))
return status;
if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset))
return status;
maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf,
&mic, NULL);
if (maj_stat != GSS_S_COMPLETE)
return status;
return 0;
}
static int
gss_unwrap_resp(struct rpc_task *task,
kxdrproc_t decode, void *rqstp, u32 *p, void *obj)
{
struct rpc_cred *cred = task->tk_msg.rpc_cred;
struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
gc_base);
struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
int status = -EIO;
u32 service;
if (ctx->gc_proc != RPC_GSS_PROC_DATA)
goto out_decode;
service = gss_pseudoflavor_to_service(ctx->gc_gss_ctx->mech_type,
gss_cred->gc_flavor);
switch (service) {
case RPC_GSS_SVC_NONE:
goto out_decode;
case RPC_GSS_SVC_INTEGRITY:
status = gss_unwrap_resp_integ(ctx, decode,
rqstp, &p, obj);
if (status)
goto out;
break;
case RPC_GSS_SVC_PRIVACY:
default:
goto out;
}
out_decode:
status = decode(rqstp, p, obj);
out:
gss_put_ctx(ctx);
dprintk("RPC: %4u gss_unwrap_resp returning %d\n", task->tk_pid,
status);
return status;
}
static struct rpc_authops authgss_ops = {
.owner = THIS_MODULE,
.au_flavor = RPC_AUTH_GSS,
#ifdef RPC_DEBUG
.au_name = "RPCSEC_GSS",
#endif
.create = gss_create,
.destroy = gss_destroy,
.crcreate = gss_create_cred
};
static struct rpc_credops gss_credops = {
.crdestroy = gss_destroy_cred,
.crmatch = gss_match,
.crmarshal = gss_marshal,
.crrefresh = gss_refresh,
.crvalidate = gss_validate,
.crwrap_req = gss_wrap_req,
.crunwrap_resp = gss_unwrap_resp,
};
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,
};
/*
* Initialize RPCSEC_GSS module
*/
static int __init init_rpcsec_gss(void)
{
int err = 0;
err = rpcauth_register(&authgss_ops);
if (err)
goto out;
err = gss_svc_init();
if (err)
goto out_unregister;
return 0;
out_unregister:
rpcauth_unregister(&authgss_ops);
out:
return err;
}
static void __exit exit_rpcsec_gss(void)
{
gss_svc_shutdown();
rpcauth_unregister(&authgss_ops);
}
MODULE_LICENSE("GPL");
module_init(init_rpcsec_gss)
module_exit(exit_rpcsec_gss)
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