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1269bc69b6
Allow root squashing to vary per-pseudoflavor, so that you can (for example) allow root access only when sufficiently strong security is in use. Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/*
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* linux/fs/nfsd/auth.c
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/sunrpc/svcauth.h>
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#include <linux/nfsd/nfsd.h>
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#define CAP_NFSD_MASK (CAP_FS_MASK|CAP_TO_MASK(CAP_SYS_RESOURCE))
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static int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp)
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{
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struct exp_flavor_info *f;
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struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
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for (f = exp->ex_flavors; f < end; f++) {
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if (f->pseudoflavor == rqstp->rq_flavor)
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return f->flags;
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}
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return exp->ex_flags;
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}
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int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
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{
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struct svc_cred cred = rqstp->rq_cred;
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int i;
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int flags = nfsexp_flags(rqstp, exp);
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int ret;
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if (flags & NFSEXP_ALLSQUASH) {
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cred.cr_uid = exp->ex_anon_uid;
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cred.cr_gid = exp->ex_anon_gid;
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cred.cr_group_info = groups_alloc(0);
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} else if (flags & NFSEXP_ROOTSQUASH) {
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struct group_info *gi;
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if (!cred.cr_uid)
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cred.cr_uid = exp->ex_anon_uid;
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if (!cred.cr_gid)
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cred.cr_gid = exp->ex_anon_gid;
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gi = groups_alloc(cred.cr_group_info->ngroups);
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if (gi)
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for (i = 0; i < cred.cr_group_info->ngroups; i++) {
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if (!GROUP_AT(cred.cr_group_info, i))
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GROUP_AT(gi, i) = exp->ex_anon_gid;
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else
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GROUP_AT(gi, i) = GROUP_AT(cred.cr_group_info, i);
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}
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cred.cr_group_info = gi;
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} else
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get_group_info(cred.cr_group_info);
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if (cred.cr_uid != (uid_t) -1)
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current->fsuid = cred.cr_uid;
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else
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current->fsuid = exp->ex_anon_uid;
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if (cred.cr_gid != (gid_t) -1)
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current->fsgid = cred.cr_gid;
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else
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current->fsgid = exp->ex_anon_gid;
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if (!cred.cr_group_info)
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return -ENOMEM;
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ret = set_current_groups(cred.cr_group_info);
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put_group_info(cred.cr_group_info);
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if ((cred.cr_uid)) {
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cap_t(current->cap_effective) &= ~CAP_NFSD_MASK;
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} else {
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cap_t(current->cap_effective) |= (CAP_NFSD_MASK &
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current->cap_permitted);
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}
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return ret;
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}
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