Release 4.15 fs/nfsd/auth.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> */

#include <linux/sched.h>
#include "nfsd.h"
#include "auth.h"



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_cred.cr_flavor)
			return f->flags;
	}
	return exp->ex_flags;

}

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J. Bruce Fields
72
100.00%
2
100.00%
Total
72
100.00%
2
100.00%



int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
{
	struct group_info *rqgi;
	struct group_info *gi;
	struct cred *new;
	int i;
	int flags = nfsexp_flags(rqstp, exp);

	validate_process_creds();

	/* discard any old override before preparing the new set */
	revert_creds(get_cred(current_real_cred()));
	new = prepare_creds();
	if (!new)
		return -ENOMEM;

	new->fsuid = rqstp->rq_cred.cr_uid;
	new->fsgid = rqstp->rq_cred.cr_gid;

	rqgi = rqstp->rq_cred.cr_group_info;

	if (flags & NFSEXP_ALLSQUASH) {
		new->fsuid = exp->ex_anon_uid;
		new->fsgid = exp->ex_anon_gid;
		gi = groups_alloc(0);
		if (!gi)
			goto oom;
	} else if (flags & NFSEXP_ROOTSQUASH) {
		if (uid_eq(new->fsuid, GLOBAL_ROOT_UID))
			new->fsuid = exp->ex_anon_uid;
		if (gid_eq(new->fsgid, GLOBAL_ROOT_GID))
			new->fsgid = exp->ex_anon_gid;

		gi = groups_alloc(rqgi->ngroups);
		if (!gi)
			goto oom;

		for (i = 0; i < rqgi->ngroups; i++) {
			if (gid_eq(GLOBAL_ROOT_GID, rqgi->gid[i]))
				gi->gid[i] = exp->ex_anon_gid;
			else
				gi->gid[i] = rqgi->gid[i];
		}

		/* Each thread allocates its own gi, no race */
		groups_sort(gi);
	} else {
		gi = get_group_info(rqgi);
	}

	if (uid_eq(new->fsuid, INVALID_UID))
		new->fsuid = exp->ex_anon_uid;
	if (gid_eq(new->fsgid, INVALID_GID))
		new->fsgid = exp->ex_anon_gid;

	set_groups(new, gi);
	put_group_info(gi);

	if (!uid_eq(new->fsuid, GLOBAL_ROOT_UID))
		new->cap_effective = cap_drop_nfsd_set(new->cap_effective);
	else
		new->cap_effective = cap_raise_nfsd_set(new->cap_effective,
							new->cap_permitted);
	validate_process_creds();
	put_cred(override_creds(new));
	put_cred(new);
	validate_process_creds();
	return 0;

oom:
	abort_creds(new);
	return -ENOMEM;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
143
36.11%
5
21.74%
Linus Torvalds (pre-git)
118
29.80%
3
13.04%
Andrew Morton
34
8.59%
3
13.04%
Eric W. Biedermann
31
7.83%
2
8.70%
J. Bruce Fields
24
6.06%
3
13.04%
Alexey Dobriyan
16
4.04%
1
4.35%
Andrew G. Morgan
10
2.53%
1
4.35%
Neil Brown
9
2.27%
1
4.35%
Thiago Rafael Becker
6
1.52%
1
4.35%
Kinglong Mee
2
0.51%
1
4.35%
Jeff Layton
2
0.51%
1
4.35%
Ben Hutchings
1
0.25%
1
4.35%
Total
396
100.00%
23
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
143
29.85%
5
17.24%
Linus Torvalds (pre-git)
123
25.68%
3
10.34%
J. Bruce Fields
99
20.67%
6
20.69%
Andrew Morton
34
7.10%
3
10.34%
Eric W. Biedermann
31
6.47%
2
6.90%
Alexey Dobriyan
16
3.34%
1
3.45%
Andrew G. Morgan
10
2.09%
1
3.45%
Neil Brown
9
1.88%
1
3.45%
Thiago Rafael Becker
6
1.25%
1
3.45%
Kinglong Mee
2
0.42%
1
3.45%
Jeff Layton
2
0.42%
1
3.45%
Harvey Harrison
1
0.21%
1
3.45%
Boaz Harrosh
1
0.21%
1
3.45%
Ben Hutchings
1
0.21%
1
3.45%
Greg Kroah-Hartman
1
0.21%
1
3.45%
Total
479
100.00%
29
100.00%
Directory: fs/nfsd

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