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nfsd: pass client principal name in rsc downcall

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Two principals are involved in krb5 authentication: the target, who we
authenticate *to* (normally the name of the server, like
nfs/server.citi.umich.edu@CITI.UMICH.EDU), and the source, we we
authenticate *as* (normally a user, like bfields@UMICH.EDU)

In the case of NFSv4 callbacks, the target of the callback should be the
source of the client's setclientid call, and the source should be the
nfs server's own principal.

Therefore we allow svcgssd to pass down the name of the principal that
just authenticated, so that on setclientid we can store that principal
name with the new client, to be used later on callbacks.

Signed-off-by: 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 16:17:15 -05:00 committed by Trond Myklebust
parent 34769fc488
commit 68e76ad0ba
4 changed files with 36 additions and 0 deletions
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11
fs/nfsd/nfs4state.c
View file

@ -54,6 +54,7 @@
#include <linux/mutex.h>
#include <linux/lockd/bind.h>
#include <linux/module.h>
#include <linux/sunrpc/svcauth_gss.h>
#define NFSDDBG_FACILITY NFSDDBG_PROC
@ -377,6 +378,7 @@ free_client(struct nfs4_client *clp)
shutdown_callback_client(clp);
if (clp->cl_cred.cr_group_info)
put_group_info(clp->cl_cred.cr_group_info);
kfree(clp->cl_principal);
kfree(clp->cl_name.data);
kfree(clp);
}
@ -696,6 +698,7 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
unsigned int strhashval;
struct nfs4_client *conf, *unconf, *new;
__be32 status;
char *princ;
char dname[HEXDIR_LEN];
if (!check_name(clname))
@ -783,6 +786,14 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
}
copy_verf(new, &clverifier);
new->cl_addr = sin->sin_addr.s_addr;
princ = svc_gss_principal(rqstp);
if (princ) {
new->cl_principal = kstrdup(princ, GFP_KERNEL);
if (new->cl_principal == NULL) {
free_client(new);
goto out;
}
}
copy_cred(&new->cl_cred, &rqstp->rq_cred);
gen_confirm(new);
gen_callback(new, setclid);

1
include/linux/nfsd/state.h
View file

@ -124,6 +124,7 @@ struct nfs4_client {
nfs4_verifier cl_verifier; /* generated by client */
time_t cl_time; /* time of last lease renewal */
__be32 cl_addr; /* client ipaddress */
char *cl_principal; /* setclientid principal name */
struct svc_cred cl_cred; /* setclientid principal */
clientid_t cl_clientid; /* generated by server */
nfs4_verifier cl_confirm; /* generated by server */

1
include/linux/sunrpc/svcauth_gss.h
View file

@ -20,6 +20,7 @@ int gss_svc_init(void);
void gss_svc_shutdown(void);
int svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name);
u32 svcauth_gss_flavor(struct auth_domain *dom);
char *svc_gss_principal(struct svc_rqst *);
#endif /* __KERNEL__ */
#endif /* _LINUX_SUNRPC_SVCAUTH_GSS_H */

23
net/sunrpc/auth_gss/svcauth_gss.c
View file

@ -332,6 +332,7 @@ struct rsc {
struct svc_cred cred;
struct gss_svc_seq_data seqdata;
struct gss_ctx *mechctx;
char *client_name;
};
static struct cache_head *rsc_table[RSC_HASHMAX];
@ -346,6 +347,7 @@ static void rsc_free(struct rsc *rsci)
gss_delete_sec_context(&rsci->mechctx);
if (rsci->cred.cr_group_info)
put_group_info(rsci->cred.cr_group_info);
kfree(rsci->client_name);
}
static void rsc_put(struct kref *ref)
@ -383,6 +385,7 @@ rsc_init(struct cache_head *cnew, struct cache_head *ctmp)
tmp->handle.data = NULL;
new->mechctx = NULL;
new->cred.cr_group_info = NULL;
new->client_name = NULL;
}
static void
@ -397,6 +400,8 @@ update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
spin_lock_init(&new->seqdata.sd_lock);
new->cred = tmp->cred;
tmp->cred.cr_group_info = NULL;
new->client_name = tmp->client_name;
tmp->client_name = NULL;
}
static struct cache_head *
@ -486,6 +491,15 @@ static int rsc_parse(struct cache_detail *cd,
status = gss_import_sec_context(buf, len, gm, &rsci.mechctx);
if (status)
goto out;
/* get client name */
len = qword_get(&mesg, buf, mlen);
if (len > 0) {
rsci.client_name = kstrdup(buf, GFP_KERNEL);
if (!rsci.client_name)
goto out;
}
}
rsci.h.expiry_time = expiry;
rscp = rsc_update(&rsci, rscp);
@ -913,6 +927,15 @@ struct gss_svc_data {
struct rsc *rsci;
};
char *svc_gss_principal(struct svc_rqst *rqstp)
{
struct gss_svc_data *gd = (struct gss_svc_data *)rqstp->rq_auth_data;
if (gd && gd->rsci)
return gd->rsci->client_name;
return NULL;
}
static int
svcauth_gss_set_client(struct svc_rqst *rqstp)
{