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Fix ACL checks for NFS kernel server

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This PR changes ZFS ACL checks to evaluate
fsuid / fsgid rather than euid / egid to avoid
accidentally granting elevated permissions to
NFS clients.

Reviewed-by: Serapheim Dimitropoulos <serapheim@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Co-authored-by: Andrew Walker <awalker@ixsystems.com>
Signed-off-by: Ryan Moeller <freqlabs@FreeBSD.org>
Closes #13221
This commit is contained in:
Ryan Moeller
2022-03-18 08:47:57 -04:00
committed by GitHub
parent a5920d24c0
commit d42979c6ef
12 changed files with 27 additions and 270 deletions
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include/os/freebsd/spl/sys/cred.h
+10 -128
View File
@@ -48,138 +48,20 @@ extern "C" {
typedef struct ucred cred_t;
#define CRED() curthread->td_ucred
/*
* kcred is used when you need all privileges.
*/
#define kcred (thread0.td_ucred)
#define KUID_TO_SUID(x) (x)
#define KGID_TO_SGID(x) (x)
#define crgetuid(cred) ((cred)->cr_uid)
#define crgetruid(cred) ((cred)->cr_ruid)
#define crgetgid(cred) ((cred)->cr_gid)
#define crgetgroups(cred) ((cred)->cr_groups)
#define crgetngroups(cred) ((cred)->cr_ngroups)
#define crgetsid(cred, i) (NULL)
struct proc; /* cred.h is included in proc.h */
struct prcred;
struct ksid;
struct ksidlist;
struct credklpd;
struct credgrp;
struct auditinfo_addr; /* cred.h is included in audit.h */
extern int ngroups_max;
/*
* kcred is used when you need all privileges.
*/
extern void cred_init(void);
extern void crfree(cred_t *);
extern cred_t *cralloc(void); /* all but ref uninitialized */
extern cred_t *cralloc_ksid(void); /* cralloc() + ksid alloc'ed */
extern cred_t *crget(void); /* initialized */
extern void crcopy_to(cred_t *, cred_t *);
extern cred_t *crdup(cred_t *);
extern void crdup_to(cred_t *, cred_t *);
extern cred_t *crgetcred(void);
extern void crset(struct proc *, cred_t *);
extern void crset_zone_privall(cred_t *);
extern int supgroupmember(gid_t, const cred_t *);
extern int hasprocperm(const cred_t *, const cred_t *);
extern int prochasprocperm(struct proc *, struct proc *, const cred_t *);
extern int crcmp(const cred_t *, const cred_t *);
extern cred_t *zone_kcred(void);
extern gid_t crgetrgid(const cred_t *);
extern gid_t crgetsgid(const cred_t *);
#define crgetzoneid(cr) ((cr)->cr_prison->pr_id)
extern projid_t crgetprojid(const cred_t *);
extern cred_t *crgetmapped(const cred_t *);
extern const struct auditinfo_addr *crgetauinfo(const cred_t *);
extern struct auditinfo_addr *crgetauinfo_modifiable(cred_t *);
extern uint_t crgetref(const cred_t *);
extern const gid_t *crgetggroups(const struct credgrp *);
/*
* Sets real, effective and/or saved uid/gid;
* -1 argument accepted as "no change".
*/
extern int crsetresuid(cred_t *, uid_t, uid_t, uid_t);
extern int crsetresgid(cred_t *, gid_t, gid_t, gid_t);
/*
* Sets real, effective and saved uids/gids all to the same
* values. Both values must be non-negative and <= MAXUID
*/
extern int crsetugid(cred_t *, uid_t, gid_t);
/*
* Functions to handle the supplemental group list.
*/
extern struct credgrp *crgrpcopyin(int, gid_t *);
extern void crgrprele(struct credgrp *);
extern void crsetcredgrp(cred_t *, struct credgrp *);
/*
* Private interface for setting zone association of credential.
*/
struct zone;
extern void crsetzone(cred_t *, struct zone *);
extern struct zone *crgetzone(const cred_t *);
/*
* Private interface for setting project id in credential.
*/
extern void crsetprojid(cred_t *, projid_t);
/*
* Private interface for nfs.
*/
extern cred_t *crnetadjust(cred_t *);
/*
* Private interface for procfs.
*/
extern void cred2prcred(const cred_t *, struct prcred *);
/*
* Private interfaces for Rampart Trusted Solaris.
*/
struct ts_label_s;
extern struct ts_label_s *crgetlabel(const cred_t *);
extern boolean_t crisremote(const cred_t *);
/*
* Private interfaces for ephemeral uids.
*/
#define VALID_UID(id, zn) \
((id) <= MAXUID || valid_ephemeral_uid((zn), (id)))
#define VALID_GID(id, zn) \
((id) <= MAXUID || valid_ephemeral_gid((zn), (id)))
extern boolean_t valid_ephemeral_uid(struct zone *, uid_t);
extern boolean_t valid_ephemeral_gid(struct zone *, gid_t);
extern int eph_uid_alloc(struct zone *, int, uid_t *, int);
extern int eph_gid_alloc(struct zone *, int, gid_t *, int);
extern void crsetsid(cred_t *, struct ksid *, int);
extern void crsetsidlist(cred_t *, struct ksidlist *);
extern struct ksidlist *crgetsidlist(const cred_t *);
extern int crsetpriv(cred_t *, ...);
extern struct credklpd *crgetcrklpd(const cred_t *);
extern void crsetcrklpd(cred_t *, struct credklpd *);
#define crgetuid(cr) ((cr)->cr_uid)
#define crgetruid(cr) ((cr)->cr_ruid)
#define crgetgid(cr) ((cr)->cr_gid)
#define crgetgroups(cr) ((cr)->cr_groups)
#define crgetngroups(cr) ((cr)->cr_ngroups)
#define crgetzoneid(cr) ((cr)->cr_prison->pr_id)
#ifdef __cplusplus
}