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SUNRPC: Use namespace of listening daemon in the client AUTH_GSS upcall 

When the client needs to talk to rpc.gssd, we should ensure that the
uid argument is encoded to match the user namespace of the daemon.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2019-04-24 17:46:45 -04:00 committed by Anna Schumaker
parent 283ebe3ec4
commit ac83228a71
1 changed files with 44 additions and 16 deletions
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60
net/sunrpc/auth_gss/auth_gss.c
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@ -269,6 +269,7 @@ err:
struct gss_upcall_msg {
refcount_t count;
kuid_t uid;
const char *service_name;
struct rpc_pipe_msg msg;
struct list_head list;
struct gss_auth *auth;
@ -316,6 +317,7 @@ gss_release_msg(struct gss_upcall_msg *gss_msg)
gss_put_ctx(gss_msg->ctx);
rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
gss_put_auth(gss_msg->auth);
kfree_const(gss_msg->service_name);
kfree(gss_msg);
}
@ -410,10 +412,10 @@ gss_upcall_callback(struct rpc_task *task)
gss_release_msg(gss_msg);
}
static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg)
static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg,
const struct cred *cred)
{
struct user_namespace *userns = gss_msg->auth->client->cl_cred ?
gss_msg->auth->client->cl_cred->user_ns : &init_user_ns;
struct user_namespace *userns = cred->user_ns;
uid_t uid = from_kuid_munged(userns, gss_msg->uid);
memcpy(gss_msg->databuf, &uid, sizeof(uid));
@ -423,12 +425,24 @@ static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg)
BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf));
}
static ssize_t
gss_v0_upcall(struct file *file, struct rpc_pipe_msg *msg,
char __user *buf, size_t buflen)
{
struct gss_upcall_msg *gss_msg = container_of(msg,
struct gss_upcall_msg,
msg);
if (msg->copied == 0)
gss_encode_v0_msg(gss_msg, file->f_cred);
return rpc_pipe_generic_upcall(file, msg, buf, buflen);
}
static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
const char *service_name,
const char *target_name)
const char *target_name,
const struct cred *cred)
{
struct user_namespace *userns = gss_msg->auth->client->cl_cred ?
gss_msg->auth->client->cl_cred->user_ns : &init_user_ns;
struct user_namespace *userns = cred->user_ns;
struct gss_api_mech *mech = gss_msg->auth->mech;
char *p = gss_msg->databuf;
size_t buflen = sizeof(gss_msg->databuf);
@ -496,6 +510,25 @@ out_overflow:
return -ENOMEM;
}
static ssize_t
gss_v1_upcall(struct file *file, struct rpc_pipe_msg *msg,
char __user *buf, size_t buflen)
{
struct gss_upcall_msg *gss_msg = container_of(msg,
struct gss_upcall_msg,
msg);
int err;
if (msg->copied == 0) {
err = gss_encode_v1_msg(gss_msg,
gss_msg->service_name,
gss_msg->auth->target_name,
file->f_cred);
if (err)
return err;
}
return rpc_pipe_generic_upcall(file, msg, buf, buflen);
}
static struct gss_upcall_msg *
gss_alloc_msg(struct gss_auth *gss_auth,
kuid_t uid, const char *service_name)
@ -518,16 +551,11 @@ gss_alloc_msg(struct gss_auth *gss_auth,
refcount_set(&gss_msg->count, 1);
gss_msg->uid = uid;
gss_msg->auth = gss_auth;
switch (vers) {
case 0:
gss_encode_v0_msg(gss_msg);
break;
default:
err = gss_encode_v1_msg(gss_msg, service_name, gss_auth->target_name);
if (err)
if (service_name) {
gss_msg->service_name = kstrdup_const(service_name, GFP_NOFS);
if (!gss_msg->service_name)
goto err_put_pipe_version;
}
kref_get(&gss_auth->kref);
return gss_msg;
err_put_pipe_version:
put_pipe_version(gss_auth->net);
@ -2120,7 +2148,7 @@ static const struct rpc_credops gss_nullops = {
};
static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
.upcall = rpc_pipe_generic_upcall,
.upcall = gss_v0_upcall,
.downcall = gss_pipe_downcall,
.destroy_msg = gss_pipe_destroy_msg,
.open_pipe = gss_pipe_open_v0,
@ -2128,7 +2156,7 @@ static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
};
static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
.upcall = rpc_pipe_generic_upcall,
.upcall = gss_v1_upcall,
.downcall = gss_pipe_downcall,
.destroy_msg = gss_pipe_destroy_msg,
.open_pipe = gss_pipe_open_v1,