diff options
Diffstat (limited to 'fs/nfs')
| -rw-r--r-- | fs/nfs/callback.c | 36 |
1 files changed, 31 insertions, 5 deletions
diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c index c2e9cfd9e5a4..3e634f2a1083 100644 --- a/fs/nfs/callback.c +++ b/fs/nfs/callback.c @@ -16,6 +16,7 @@ #include <linux/mutex.h> #include <linux/freezer.h> #include <linux/kthread.h> +#include <linux/sunrpc/svcauth_gss.h> #include <net/inet_sock.h> @@ -182,10 +183,34 @@ void nfs_callback_down(void) mutex_unlock(&nfs_callback_mutex); } +static int check_gss_callback_principal(struct nfs_client *clp, + struct svc_rqst *rqstp) +{ + struct rpc_clnt *r = clp->cl_rpcclient; + char *p = svc_gss_principal(rqstp); + + /* + * It might just be a normal user principal, in which case + * userspace won't bother to tell us the name at all. + */ + if (p == NULL) + return SVC_DENIED; + + /* Expect a GSS_C_NT_HOSTBASED_NAME like "nfs@serverhostname" */ + + if (memcmp(p, "nfs@", 4) != 0) + return SVC_DENIED; + p += 4; + if (strcmp(p, r->cl_server) != 0) + return SVC_DENIED; + return SVC_OK; +} + static int nfs_callback_authenticate(struct svc_rqst *rqstp) { struct nfs_client *clp; RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); + int ret = SVC_OK; /* Don't talk to strangers */ clp = nfs_find_client(svc_addr(rqstp), 4); @@ -194,21 +219,22 @@ static int nfs_callback_authenticate(struct svc_rqst *rqstp) dprintk("%s: %s NFSv4 callback!\n", __func__, svc_print_addr(rqstp, buf, sizeof(buf))); - nfs_put_client(clp); switch (rqstp->rq_authop->flavour) { case RPC_AUTH_NULL: if (rqstp->rq_proc != CB_NULL) - return SVC_DENIED; + ret = SVC_DENIED; break; case RPC_AUTH_UNIX: break; case RPC_AUTH_GSS: - /* FIXME: RPCSEC_GSS handling? */ + ret = check_gss_callback_principal(clp, rqstp); + break; default: - return SVC_DENIED; + ret = SVC_DENIED; } - return SVC_OK; + nfs_put_client(clp); + return ret; } /* |