Add server support for properly decoding and using spo_must_enforce
and spo_must_allow bits. Add support for machine credentials to be
used for CLOSE, OPEN_DOWNGRADE, LOCKU, DELEGRETURN,
and TEST/FREE STATEID.
Implement a check so as to not throw WRONGSEC errors when these
operations are used if integrity/privacy isn't turned on.
Signed-off-by: Andrew Elble <aweits@xxxxxxx>
---
fs/nfsd/export.c | 4 ++++
fs/nfsd/nfs4proc.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/nfsd/nfs4state.c | 18 ++++++++++++++
fs/nfsd/nfs4xdr.c | 51 ++++++++++++++++++---------------------
fs/nfsd/nfsd.h | 5 ++++
fs/nfsd/state.h | 1 +
fs/nfsd/xdr4.h | 3 +++
7 files changed, 123 insertions(+), 28 deletions(-)
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index b4d84b579f20..0395e3e8fc3e 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -954,6 +954,10 @@ __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
return 0;
}
+
+ if (nfsd4_spo_must_allow(rqstp))
+ return 0;
+
return nfserr_wrongsec;
}
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index a9f096c7e99f..047d6662010b 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -2285,6 +2285,75 @@ static struct nfsd4_operation nfsd4_ops[] = {
},
};
+/**
+ * nfsd4_spo_must_allow - Determine if the compound op contains an
+ * operation that is allowed to be sent with machine credentials
+ *
+ * @rqstp: a pointer to the struct svc_rqst
+ *
+ * nfsd4_spo_must_allow() allows check_nfsd_access() to succeed
+ * when the operation and/or the FH+operation(s) is part of what the
+ * client negotiated to be able to send with machine credentials.
+ * We keep some state so that FH+operation(s) can succeed despite
+ * check_nfsd_access() being called from fh_verify() as well as
+ * nfsd4_proc_compound().
+ */
+
+bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
+{
+ struct nfsd4_compoundres *resp = rqstp->rq_resp;
+ struct nfsd4_compoundargs *argp = rqstp->rq_argp;
+ struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
+ struct nfsd4_compound_state *cstate = &resp->cstate;
+ struct nfsd4_operation *thisd;
+ struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
+ u32 opiter;
+
+ if (!cstate->minorversion)
+ return false;
+
+ thisd = OPDESC(this);
+
+ if (!(thisd->op_flags & OP_IS_PUTFH_LIKE)) {
+ if (cstate->spo_must_allowed == true)
+ /*
+ * a prior putfh + op has set
+ * spo_must_allow conditions
+ */
+ return true;
+ /* evaluate op against spo_must_allow with no prior putfh */
+ if (test_bit(this->opnum, allow->u.longs) &&
+ cstate->clp->cl_mach_cred &&
+ nfsd4_mach_creds_match(cstate->clp, rqstp))
+ return true;
+ else
+ return false;
+ }
+ /*
+ * this->opnum has PUTFH ramifications
+ * scan forward to next putfh or end of compound op
+ */
+ opiter = resp->opcnt;
+ while (opiter < argp->opcnt) {
+ this = &argp->ops[opiter++];
+ thisd = OPDESC(this);
+ if (thisd->op_flags & OP_IS_PUTFH_LIKE)
+ break;
+ if (test_bit(this->opnum, allow->u.longs) &&
+ cstate->clp->cl_mach_cred &&
+ nfsd4_mach_creds_match(cstate->clp, rqstp)) {
+ /*
+ * the op covered by the fh is a
+ * spo_must_allow operation
+ */
+ cstate->spo_must_allowed = true;
+ return true;
+ }
+ }
+ cstate->spo_must_allowed = false;
+ return false;
+}
+
int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
{
struct nfsd4_operation *opdesc;
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 65efc900e97e..b28805519725 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2367,6 +2367,22 @@ nfsd4_exchange_id(struct svc_rqst *rqstp,
switch (exid->spa_how) {
case SP4_MACH_CRED:
+ exid->spo_must_enforce[0] = 0;
+ exid->spo_must_enforce[1] = (
+ 1 << (OP_BIND_CONN_TO_SESSION - 32) |
+ 1 << (OP_EXCHANGE_ID - 32) |
+ 1 << (OP_CREATE_SESSION - 32) |
+ 1 << (OP_DESTROY_SESSION - 32) |
+ 1 << (OP_DESTROY_CLIENTID - 32));
+
+ exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
+ 1 << (OP_OPEN_DOWNGRADE) |
+ 1 << (OP_LOCKU) |
+ 1 << (OP_DELEGRETURN));
+
+ exid->spo_must_allow[1] &= (
+ 1 << (OP_TEST_STATEID - 32) |
+ 1 << (OP_FREE_STATEID - 32));
if (!svc_rqst_integrity_protected(rqstp))
return nfserr_inval;
case SP4_NONE:
@@ -2443,6 +2459,8 @@ out_new:
}
new->cl_minorversion = cstate->minorversion;
new->cl_mach_cred = (exid->spa_how == SP4_MACH_CRED);
+ new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
+ new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
gen_clid(new, nn);
add_to_unconfirmed(new);
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 51c9e9ca39a4..e2043aa95e27 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1297,16 +1297,14 @@ nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
break;
case SP4_MACH_CRED:
/* spo_must_enforce */
- READ_BUF(4);
- dummy = be32_to_cpup(p++);
- READ_BUF(dummy * 4);
- p += dummy;
-
+ status = nfsd4_decode_bitmap(argp,
+ exid->spo_must_enforce);
+ if (status)
+ goto out;
/* spo_must_allow */
- READ_BUF(4);
- dummy = be32_to_cpup(p++);
- READ_BUF(dummy * 4);
- p += dummy;
+ status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
+ if (status)
+ goto out;
break;
case SP4_SSV:
/* ssp_ops */
@@ -3841,14 +3839,6 @@ nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_w
return nfserr;
}
-static const u32 nfs4_minimal_spo_must_enforce[2] = {
- [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
- 1 << (OP_EXCHANGE_ID - 32) |
- 1 << (OP_CREATE_SESSION - 32) |
- 1 << (OP_DESTROY_SESSION - 32) |
- 1 << (OP_DESTROY_CLIENTID - 32)
-};
-
static __be32
nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_exchange_id *exid)
@@ -3859,6 +3849,7 @@ nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
char *server_scope;
int major_id_sz;
int server_scope_sz;
+ int status = 0;
uint64_t minor_id = 0;
if (nfserr)
@@ -3887,18 +3878,20 @@ nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
case SP4_NONE:
break;
case SP4_MACH_CRED:
- /* spo_must_enforce, spo_must_allow */
- p = xdr_reserve_space(xdr, 16);
- if (!p)
- return nfserr_resource;
-
/* spo_must_enforce bitmap: */
- *p++ = cpu_to_be32(2);
- *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
- *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
- /* empty spo_must_allow bitmap: */
- *p++ = cpu_to_be32(0);
-
+ status = nfsd4_encode_bitmap(xdr,
+ exid->spo_must_enforce[0],
+ exid->spo_must_enforce[1],
+ exid->spo_must_enforce[2]);
+ if (status)
+ goto out;
+ /* spo_must_allow bitmap: */
+ status = nfsd4_encode_bitmap(xdr,
+ exid->spo_must_allow[0],
+ exid->spo_must_allow[1],
+ exid->spo_must_allow[2]);
+ if (status)
+ goto out;
break;
default:
WARN_ON_ONCE(1);
@@ -3925,6 +3918,8 @@ nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
/* Implementation id */
*p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
return 0;
+out:
+ return status;
}
static __be32
diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
index cf980523898b..9446849888d5 100644
--- a/fs/nfsd/nfsd.h
+++ b/fs/nfsd/nfsd.h
@@ -124,6 +124,7 @@ void nfs4_state_shutdown_net(struct net *net);
void nfs4_reset_lease(time_t leasetime);
int nfs4_reset_recoverydir(char *recdir);
char * nfs4_recoverydir(void);
+bool nfsd4_spo_must_allow(struct svc_rqst *rqstp);
#else
static inline int nfsd4_init_slabs(void) { return 0; }
static inline void nfsd4_free_slabs(void) { }
@@ -134,6 +135,10 @@ static inline void nfs4_state_shutdown_net(struct net *net) { }
static inline void nfs4_reset_lease(time_t leasetime) { }
static inline int nfs4_reset_recoverydir(char *recdir) { return 0; }
static inline char * nfs4_recoverydir(void) {return NULL; }
+static inline bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
+{
+ return false;
+}
#endif
/*
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 77fdf4de91ba..2b59c74f098c 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -345,6 +345,7 @@ struct nfs4_client {
u32 cl_exchange_flags;
/* number of rpc's in progress over an associated session: */
atomic_t cl_refcount;
+ struct nfs4_op_map cl_spo_must_allow;
/* for nfs41 callbacks */
/* We currently support a single back channel with a single slot */
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 25c9c79460f9..c88aca9c42d7 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -59,6 +59,7 @@ struct nfsd4_compound_state {
struct nfsd4_session *session;
struct nfsd4_slot *slot;
int data_offset;
+ bool spo_must_allowed;
size_t iovlen;
u32 minorversion;
__be32 status;
@@ -403,6 +404,8 @@ struct nfsd4_exchange_id {
clientid_t clientid;
u32 seqid;
int spa_how;
+ u32 spo_must_enforce[3];
+ u32 spo_must_allow[3];
};
struct nfsd4_sequence {
--
2.6.3
--
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