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/*
* linux/fs/nfsd/auth.c
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/svcauth.h>
#include <linux/nfsd/nfsd.h>
#define CAP_NFSD_MASK (CAP_FS_MASK|CAP_TO_MASK(CAP_SYS_RESOURCE))
static int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp)
{
struct exp_flavor_info *f;
struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
for (f = exp->ex_flavors; f < end; f++) {
if (f->pseudoflavor == rqstp->rq_flavor)
return f->flags;
}
return exp->ex_flags;
}
int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
{
struct svc_cred cred = rqstp->rq_cred;
int i;
int flags = nfsexp_flags(rqstp, exp);
int ret;
if (flags & NFSEXP_ALLSQUASH) {
cred.cr_uid = exp->ex_anon_uid;
cred.cr_gid = exp->ex_anon_gid;
cred.cr_group_info = groups_alloc(0);
} else if (flags & NFSEXP_ROOTSQUASH) {
struct group_info *gi;
if (!cred.cr_uid)
cred.cr_uid = exp->ex_anon_uid;
if (!cred.cr_gid)
cred.cr_gid = exp->ex_anon_gid;
gi = groups_alloc(cred.cr_group_info->ngroups);
if (gi)
for (i = 0; i < cred.cr_group_info->ngroups; i++) {
if (!GROUP_AT(cred.cr_group_info, i))
GROUP_AT(gi, i) = exp->ex_anon_gid;
else
GROUP_AT(gi, i) = GROUP_AT(cred.cr_group_info, i);
}
cred.cr_group_info = gi;
} else
get_group_info(cred.cr_group_info);
if (cred.cr_uid != (uid_t) -1)
current->fsuid = cred.cr_uid;
else
current->fsuid = exp->ex_anon_uid;
if (cred.cr_gid != (gid_t) -1)
current->fsgid = cred.cr_gid;
else
current->fsgid = exp->ex_anon_gid;
if (!cred.cr_group_info)
return -ENOMEM;
ret = set_current_groups(cred.cr_group_info);
put_group_info(cred.cr_group_info);
if ((cred.cr_uid)) {
cap_t(current->cap_effective) &= ~CAP_NFSD_MASK;
} else {
cap_t(current->cap_effective) |= (CAP_NFSD_MASK &
current->cap_permitted);
}
return ret;
}
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