d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

nfsd: Fix the failure return for non-fh NFSv4 operations

Browse Source 
Without this patch, nfsd_checkrootexp() returns failure
and then the NFSv4 operation would reply NFSERR_WRONGSEC.
RFC5661 Sec. 2.6 only allows a few NFSv4 operations, none
of which call nfsv4_checktootexp(), to return NFSERR_WRONGSEC.
This patch modifies nfsd_checkrootexp() to return the
error instead of a boolean and sets the returned error to an RPC
layer AUTH_ERR, as discussed on nfsv4@ietf.org.
The patch also fixes nfsd_errmap() so that the pseudo
error NFSERR_AUTHERR is handled correctly such that an RPC layer
AUTH_ERR is replied to the NFSv4 client.

The two new "enum auth_stat" values have not yet been assigned
by IANA, but are the expected next two values.

The effect on extant NFSv4 clients of this change appears
limited to reporting a different failure error when a
mount that does not use adequate security is attempted.

MFC after:	2 weeks
This commit is contained in:
Rick Macklem 2021-06-02 15:28:07 -07:00
parent 56fd97660a
commit 984c71f903
3 changed files with 25 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
sys/fs/nfsserver/nfs_nfsdserv.c
View File

@ -56,7 +56,6 @@ __FBSDID("$FreeBSD$");
extern u_int32_t newnfs_false, newnfs_true;
extern enum vtype nv34tov_type[8];
extern struct timeval nfsboottime;
extern int nfs_rootfhset;
extern int nfsrv_enable_crossmntpt;
extern int nfsrv_statehashsize;
extern int nfsrv_layouthashsize;
@ -3360,10 +3359,8 @@ nfsrvd_delegpurge(struct nfsrv_descript *nd, __unused int isdgram,
nfsquad_t clientid;
struct thread *p = curthread;
if (nfs_rootfhset == 0 || nfsd_checkrootexp(nd) != 0) {
nd->nd_repstat = NFSERR_WRONGSEC;
if ((nd->nd_repstat = nfsd_checkrootexp(nd)) != 0)
goto nfsmout;
}
NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
clientid.lval[0] = *tl++;
clientid.lval[1] = *tl;
@ -3625,10 +3622,8 @@ nfsrvd_renew(struct nfsrv_descript *nd, __unused int isdgram,
nd->nd_repstat = NFSERR_NOTSUPP;
goto nfsmout;
}
if (nfs_rootfhset == 0 || nfsd_checkrootexp(nd) != 0) {
nd->nd_repstat = NFSERR_WRONGSEC;
if ((nd->nd_repstat = nfsd_checkrootexp(nd)) != 0)
goto nfsmout;
}
NFSM_DISSECT(tl, u_int32_t *, NFSX_HYPER);
clientid.lval[0] = *tl++;
clientid.lval[1] = *tl;
@ -3893,10 +3888,8 @@ nfsrvd_setclientid(struct nfsrv_descript *nd, __unused int isdgram,
nd->nd_repstat = NFSERR_NOTSUPP;
goto nfsmout;
}
if (nfs_rootfhset == 0 || nfsd_checkrootexp(nd) != 0) {
nd->nd_repstat = NFSERR_WRONGSEC;
if ((nd->nd_repstat = nfsd_checkrootexp(nd)) != 0)
goto out;
}
NFSM_DISSECT(tl, u_int32_t *, NFSX_VERF + NFSX_UNSIGNED);
verf = (u_char *)tl;
tl += (NFSX_VERF / NFSX_UNSIGNED);
@ -4048,10 +4041,8 @@ nfsrvd_setclientidcfrm(struct nfsrv_descript *nd,
nd->nd_repstat = NFSERR_NOTSUPP;
goto nfsmout;
}
if (nfs_rootfhset == 0 || nfsd_checkrootexp(nd) != 0) {
nd->nd_repstat = NFSERR_WRONGSEC;
if ((nd->nd_repstat = nfsd_checkrootexp(nd)) != 0)
goto nfsmout;
}
NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_HYPER);
clientid.lval[0] = *tl++;
clientid.lval[1] = *tl++;
@ -4146,10 +4137,8 @@ nfsrvd_releaselckown(struct nfsrv_descript *nd, __unused int isdgram,
nd->nd_repstat = NFSERR_NOTSUPP;
goto nfsmout;
}
if (nfs_rootfhset == 0 || nfsd_checkrootexp(nd) != 0) {
nd->nd_repstat = NFSERR_WRONGSEC;
if ((nd->nd_repstat = nfsd_checkrootexp(nd)) != 0)
goto nfsmout;
}
NFSM_DISSECT(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
len = fxdr_unsigned(int, *(tl + 2));
if (len <= 0 || len > NFSV4_OPAQUELIMIT) {
@ -4213,10 +4202,8 @@ nfsrvd_exchangeid(struct nfsrv_descript *nd, __unused int isdgram,
#endif
struct thread *p = curthread;
if (nfs_rootfhset == 0 || nfsd_checkrootexp(nd) != 0) {
nd->nd_repstat = NFSERR_WRONGSEC;
if ((nd->nd_repstat = nfsd_checkrootexp(nd)) != 0)
goto nfsmout;
}
NFSM_DISSECT(tl, u_int32_t *, NFSX_VERF + NFSX_UNSIGNED);
verf = (uint8_t *)tl;
tl += (NFSX_VERF / NFSX_UNSIGNED);
@ -4370,10 +4357,8 @@ nfsrvd_createsession(struct nfsrv_descript *nd, __unused int isdgram,
uint32_t rdmacnt;
struct thread *p = curthread;
if (nfs_rootfhset == 0 || nfsd_checkrootexp(nd) != 0) {
nd->nd_repstat = NFSERR_WRONGSEC;
if ((nd->nd_repstat = nfsd_checkrootexp(nd)) != 0)
goto nfsmout;
}
sep = (struct nfsdsession *)malloc(sizeof(struct nfsdsession),
M_NFSDSESSION, M_WAITOK | M_ZERO);
sep->sess_refcnt = 1;
@ -4481,10 +4466,8 @@ nfsrvd_sequence(struct nfsrv_descript *nd, __unused int isdgram,
int cache_this, error = 0;
struct thread *p = curthread;
if (nfs_rootfhset == 0 || nfsd_checkrootexp(nd) != 0) {
nd->nd_repstat = NFSERR_WRONGSEC;
if ((nd->nd_repstat = nfsd_checkrootexp(nd)) != 0)
goto nfsmout;
}
NFSM_DISSECT(tl, uint32_t *, NFSX_V4SESSIONID);
NFSBCOPY(tl, nd->nd_sessionid, NFSX_V4SESSIONID);
NFSM_DISSECT(tl, uint32_t *, 4 * NFSX_UNSIGNED);
@ -4554,10 +4537,8 @@ nfsrvd_destroyclientid(struct nfsrv_descript *nd, __unused int isdgram,
int error = 0;
struct thread *p = curthread;
if (nfs_rootfhset == 0 || nfsd_checkrootexp(nd) != 0) {
nd->nd_repstat = NFSERR_WRONGSEC;
if ((nd->nd_repstat = nfsd_checkrootexp(nd)) != 0)
goto nfsmout;
}
NFSM_DISSECT(tl, uint32_t *, 2 * NFSX_UNSIGNED);
clientid.lval[0] = *tl++;
clientid.lval[1] = *tl;
@ -4578,10 +4559,8 @@ nfsrvd_bindconnsess(struct nfsrv_descript *nd, __unused int isdgram,
uint8_t sessid[NFSX_V4SESSIONID];
int error = 0, foreaft;
if (nfs_rootfhset == 0 || nfsd_checkrootexp(nd) != 0) {
nd->nd_repstat = NFSERR_WRONGSEC;
if ((nd->nd_repstat = nfsd_checkrootexp(nd)) != 0)
goto nfsmout;
}
NFSM_DISSECT(tl, uint32_t *, NFSX_V4SESSIONID + 2 * NFSX_UNSIGNED);
NFSBCOPY(tl, sessid, NFSX_V4SESSIONID);
tl += (NFSX_V4SESSIONID / NFSX_UNSIGNED);
@ -4616,10 +4595,8 @@ nfsrvd_destroysession(struct nfsrv_descript *nd, __unused int isdgram,
uint8_t *cp, sessid[NFSX_V4SESSIONID];
int error = 0;
if (nfs_rootfhset == 0 || nfsd_checkrootexp(nd) != 0) {
nd->nd_repstat = NFSERR_WRONGSEC;
if ((nd->nd_repstat = nfsd_checkrootexp(nd)) != 0)
goto nfsmout;
}
NFSM_DISSECT(cp, uint8_t *, NFSX_V4SESSIONID);
NFSBCOPY(cp, sessid, NFSX_V4SESSIONID);
nd->nd_repstat = nfsrv_destroysession(nd, sessid);

11
sys/fs/nfsserver/nfs_nfsdsubs.c
View File

@ -44,6 +44,7 @@ __FBSDID("$FreeBSD$");
#include <fs/nfs/nfsport.h>
extern u_int32_t newnfs_true, newnfs_false;
extern int nfs_rootfhset;
extern int nfs_pubfhset;
extern struct nfsclienthashhead *nfsclienthash;
extern int nfsrv_clienthashsize;
@ -1543,6 +1544,8 @@ nfsd_errmap(struct nfsrv_descript *nd)
if (!nd->nd_repstat)
return (0);
if ((nd->nd_repstat & NFSERR_AUTHERR) != 0)
return (txdr_unsigned(NFSERR_ACCES));
if (nd->nd_flag & (ND_NFSV3 | ND_NFSV4)) {
if (nd->nd_procnum == NFSPROC_NOOP)
return (txdr_unsigned(nd->nd_repstat & 0xffff));
@ -2116,6 +2119,8 @@ int
nfsd_checkrootexp(struct nfsrv_descript *nd)
{
if (nfs_rootfhset == 0)
return (NFSERR_AUTHERR | AUTH_FAILED);
if ((nd->nd_flag & (ND_GSS | ND_EXAUTHSYS)) == ND_EXAUTHSYS)
goto checktls;
if ((nd->nd_flag & (ND_GSSINTEGRITY | ND_EXGSSINTEGRITY)) ==
@ -2127,7 +2132,7 @@ nfsd_checkrootexp(struct nfsrv_descript *nd)
if ((nd->nd_flag & (ND_GSS | ND_GSSINTEGRITY | ND_GSSPRIVACY |
ND_EXGSS)) == (ND_GSS | ND_EXGSS))
goto checktls;
return (1);
return (NFSERR_AUTHERR | AUTH_TOOWEAK);
checktls:
if ((nd->nd_flag & ND_EXTLS) == 0)
return (0);
@ -2140,7 +2145,9 @@ nfsd_checkrootexp(struct nfsrv_descript *nd)
if ((nd->nd_flag & (ND_TLS | ND_EXTLSCERTUSER | ND_EXTLSCERT)) ==
ND_TLS)
return (0);
return (1);
if ((nd->nd_flag & ND_TLS) == 0)
return (NFSERR_AUTHERR | AUTH_NEEDS_TLS);
return (NFSERR_AUTHERR | AUTH_NEEDS_TLS_MUTUAL_HOST);
}
/*

5
sys/rpc/auth.h
View File

@ -150,6 +150,11 @@ enum auth_stat {
*/
RPCSEC_GSS_CREDPROBLEM = 13,
RPCSEC_GSS_CTXPROBLEM = 14,
/*
* RPC-over-TLS errors
*/
AUTH_NEEDS_TLS = 15,
AUTH_NEEDS_TLS_MUTUAL_HOST = 16,
/* Also used by RPCSEC_TLS for the same purpose */
RPCSEC_GSS_NODISPATCH = 0x8000000
};