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rpc: add service field to new upcall 

This patch extends the new upcall with a "service" field that currently
can have 2 values: "*" or "nfs". These values specify matching rules for
principals in the keytab file. The "*" means that gssd is allowed to use
"root", "nfs", or "host" keytab entries while the other option requires
"nfs".

Restricting gssd to use the "nfs" principal is needed for when the
server performs a callback to the client.  The server in this case has
to authenticate itself as an "nfs" principal.

We also need "service" field to distiguish between two client-side cases
both currently using a uid of 0: the case of regular file access by the
root user, and the case of state-management calls (such as setclientid)
which should use a keytab for authentication.  (And the upcall should
fail if an appropriate principal can't be found.)

Signed-off: Olga Kornievskaia <aglo@citi.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Olga Kornievskaia 2008-12-23 16:19:56 -05:00 committed by Trond Myklebust
parent 8b1c7bf5b6
commit 2efef7080f
1 changed files with 16 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
net/sunrpc/auth_gss/auth_gss.c
View File

@ -369,7 +369,7 @@ static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg)
}
static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
struct rpc_clnt *clnt)
struct rpc_clnt *clnt, int machine_cred)
{
char *p = gss_msg->databuf;
int len = 0;
@ -383,6 +383,15 @@ static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
p += len;
gss_msg->msg.len += len;
}
if (machine_cred) {
len = sprintf(p, "service=* ");
p += len;
gss_msg->msg.len += len;
} else if (!strcmp(clnt->cl_program->name, "nfs4_cb")) {
len = sprintf(p, "service=nfs ");
p += len;
gss_msg->msg.len += len;
}
len = sprintf(p, "\n");
gss_msg->msg.len += len;
@ -391,16 +400,17 @@ static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
}
static void gss_encode_msg(struct gss_upcall_msg *gss_msg,
struct rpc_clnt *clnt)
struct rpc_clnt *clnt, int machine_cred)
{
if (pipe_version == 0)
gss_encode_v0_msg(gss_msg);
else /* pipe_version == 1 */
gss_encode_v1_msg(gss_msg, clnt);
gss_encode_v1_msg(gss_msg, clnt, machine_cred);
}
static inline struct gss_upcall_msg *
gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid, struct rpc_clnt *clnt)
gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid, struct rpc_clnt *clnt,
int machine_cred)
{
struct gss_upcall_msg *gss_msg;
int vers;
@ -420,7 +430,7 @@ gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid, struct rpc_clnt *clnt)
atomic_set(&gss_msg->count, 1);
gss_msg->uid = uid;
gss_msg->auth = gss_auth;
gss_encode_msg(gss_msg, clnt);
gss_encode_msg(gss_msg, clnt, machine_cred);
return gss_msg;
}
@ -432,11 +442,7 @@ gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cr
struct gss_upcall_msg *gss_new, *gss_msg;
uid_t uid = cred->cr_uid;
/* Special case: rpc.gssd assumes that uid == 0 implies machine creds */
if (gss_cred->gc_machine_cred != 0)
uid = 0;
gss_new = gss_alloc_msg(gss_auth, uid, clnt);
gss_new = gss_alloc_msg(gss_auth, uid, clnt, gss_cred->gc_machine_cred);
if (IS_ERR(gss_new))
return gss_new;
gss_msg = gss_add_msg(gss_auth, gss_new);