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nfs4.1: Minimal SP4_MACH_CRED implementation 

This is a minimal client side implementation of SP4_MACH_CRED.  It will
attempt to negotiate SP4_MACH_CRED iff the EXCHANGE_ID is using
krb5i or krb5p auth.  SP4_MACH_CRED will be used if the server supports the
minimal operations:

 BIND_CONN_TO_SESSION
 EXCHANGE_ID
 CREATE_SESSION
 DESTROY_SESSION
 DESTROY_CLIENTID

This patch only includes the EXCHANGE_ID negotiation code because
the client will already use the machine cred for these operations.

If the server doesn't support SP4_MACH_CRED or doesn't support the minimal
operations, the exchange id will be resent with SP4_NONE.

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Weston Andros Adamson 2013-08-13 16:37:32 -04:00 committed by Trond Myklebust
parent 92cb6c5be8
commit 2031cd1af1
4 changed files with 213 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

137
fs/nfs/nfs4proc.c
View File

@ -6117,16 +6117,87 @@ out:
}
/*
* nfs4_proc_exchange_id()
*
* Returns zero, a negative errno, or a negative NFS4ERR status code.
*
* Since the clientid has expired, all compounds using sessions
* associated with the stale clientid will be returning
* NFS4ERR_BADSESSION in the sequence operation, and will therefore
* be in some phase of session reset.
* Minimum set of SP4_MACH_CRED operations from RFC 5661
*/
int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
.how = SP4_MACH_CRED,
.enforce.u.words = {
[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)
}
};
/*
* Select the state protection mode for client `clp' given the server results
* from exchange_id in `sp'.
*
* Returns 0 on success, negative errno otherwise.
*/
static int nfs4_sp4_select_mode(struct nfs_client *clp,
struct nfs41_state_protection *sp)
{
static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
[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)
};
unsigned int i;
if (sp->how == SP4_MACH_CRED) {
/* Print state protect result */
dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
for (i = 0; i <= LAST_NFS4_OP; i++) {
if (test_bit(i, sp->enforce.u.longs))
dfprintk(MOUNT, " enforce op %d\n", i);
if (test_bit(i, sp->allow.u.longs))
dfprintk(MOUNT, " allow op %d\n", i);
}
/* make sure nothing is on enforce list that isn't supported */
for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
return -EINVAL;
}
}
/*
* Minimal mode - state operations are allowed to use machine
* credential. Note this already happens by default, so the
* client doesn't have to do anything more than the negotiation.
*
* NOTE: we don't care if EXCHANGE_ID is in the list -
* we're already using the machine cred for exchange_id
* and will never use a different cred.
*/
if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
dfprintk(MOUNT, "sp4_mach_cred:\n");
dfprintk(MOUNT, " minimal mode enabled\n");
set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
} else {
dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
return -EINVAL;
}
}
return 0;
}
/*
* _nfs4_proc_exchange_id()
*
* Wrapper for EXCHANGE_ID operation.
*/
static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
u32 sp4_how)
{
nfs4_verifier verifier;
struct nfs41_exchange_id_args args = {
@ -6173,11 +6244,30 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
goto out_server_scope;
}
switch (sp4_how) {
case SP4_NONE:
args.state_protect.how = SP4_NONE;
break;
case SP4_MACH_CRED:
args.state_protect = nfs4_sp4_mach_cred_request;
break;
default:
/* unsupported! */
WARN_ON_ONCE(1);
status = -EINVAL;
goto out_server_scope;
}
status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
trace_nfs4_exchange_id(clp, status);
if (status == 0)
status = nfs4_check_cl_exchange_flags(res.flags);
if (status == 0)
status = nfs4_sp4_select_mode(clp, &res.state_protect);
if (status == 0) {
clp->cl_clientid = res.clientid;
clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
@ -6224,6 +6314,35 @@ out:
return status;
}
/*
* nfs4_proc_exchange_id()
*
* Returns zero, a negative errno, or a negative NFS4ERR status code.
*
* Since the clientid has expired, all compounds using sessions
* associated with the stale clientid will be returning
* NFS4ERR_BADSESSION in the sequence operation, and will therefore
* be in some phase of session reset.
*
* Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
*/
int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
{
rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
int status;
/* try SP4_MACH_CRED if krb5i/p */
if (authflavor == RPC_AUTH_GSS_KRB5I ||
authflavor == RPC_AUTH_GSS_KRB5P) {
status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
if (!status)
return 0;
}
/* try SP4_NONE */
return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
}
static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
struct rpc_cred *cred)
{

72
fs/nfs/nfs4xdr.c
View File

@ -294,7 +294,9 @@ static int nfs4_stat_to_errno(int);
XDR_QUADLEN(NFS4_EXCHANGE_ID_LEN) + \
1 /* flags */ + \
1 /* spa_how */ + \
0 /* SP4_NONE (for now) */ + \
/* max is SP4_MACH_CRED (for now) */ + \
1 + NFS4_OP_MAP_NUM_WORDS + \
1 + NFS4_OP_MAP_NUM_WORDS + \
1 /* implementation id array of size 1 */ + \
1 /* nii_domain */ + \
XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
@ -306,7 +308,9 @@ static int nfs4_stat_to_errno(int);
1 /* eir_sequenceid */ + \
1 /* eir_flags */ + \
1 /* spr_how */ + \
0 /* SP4_NONE (for now) */ + \
/* max is SP4_MACH_CRED (for now) */ + \
1 + NFS4_OP_MAP_NUM_WORDS + \
1 + NFS4_OP_MAP_NUM_WORDS + \
2 /* eir_server_owner.so_minor_id */ + \
/* eir_server_owner.so_major_id<> */ \
XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
@ -1726,6 +1730,14 @@ static void encode_bind_conn_to_session(struct xdr_stream *xdr,
*p = 0; /* use_conn_in_rdma_mode = False */
}
static void encode_op_map(struct xdr_stream *xdr, struct nfs4_op_map *op_map)
{
unsigned int i;
encode_uint32(xdr, NFS4_OP_MAP_NUM_WORDS);
for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++)
encode_uint32(xdr, op_map->u.words[i]);
}
static void encode_exchange_id(struct xdr_stream *xdr,
struct nfs41_exchange_id_args *args,
struct compound_hdr *hdr)
@ -1739,9 +1751,20 @@ static void encode_exchange_id(struct xdr_stream *xdr,
encode_string(xdr, args->id_len, args->id);
p = reserve_space(xdr, 12);
*p++ = cpu_to_be32(args->flags);
*p++ = cpu_to_be32(0); /* zero length state_protect4_a */
encode_uint32(xdr, args->flags);
encode_uint32(xdr, args->state_protect.how);
switch (args->state_protect.how) {
case SP4_NONE:
break;
case SP4_MACH_CRED:
encode_op_map(xdr, &args->state_protect.enforce);
encode_op_map(xdr, &args->state_protect.allow);
break;
default:
WARN_ON_ONCE(1);
break;
}
if (send_implementation_id &&
sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) > 1 &&
@ -1752,7 +1775,7 @@ static void encode_exchange_id(struct xdr_stream *xdr,
utsname()->version, utsname()->machine);
if (len > 0) {
*p = cpu_to_be32(1); /* implementation id array length=1 */
encode_uint32(xdr, 1); /* implementation id array length=1 */
encode_string(xdr,
sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) - 1,
@ -1763,7 +1786,7 @@ static void encode_exchange_id(struct xdr_stream *xdr,
p = xdr_encode_hyper(p, 0);
*p = cpu_to_be32(0);
} else
*p = cpu_to_be32(0); /* implementation id array length=0 */
encode_uint32(xdr, 0); /* implementation id array length=0 */
}
static void encode_create_session(struct xdr_stream *xdr,
@ -5374,6 +5397,23 @@ static int decode_secinfo_no_name(struct xdr_stream *xdr, struct nfs4_secinfo_re
return decode_secinfo_common(xdr, res);
}
static int decode_op_map(struct xdr_stream *xdr, struct nfs4_op_map *op_map)
{
__be32 *p;
uint32_t bitmap_words;
unsigned int i;
p = xdr_inline_decode(xdr, 4);
bitmap_words = be32_to_cpup(p++);
if (bitmap_words > NFS4_OP_MAP_NUM_WORDS)
return -EIO;
p = xdr_inline_decode(xdr, 4 * bitmap_words);
for (i = 0; i < bitmap_words; i++)
op_map->u.words[i] = be32_to_cpup(p++);
return 0;
}
static int decode_exchange_id(struct xdr_stream *xdr,
struct nfs41_exchange_id_res *res)
{
@ -5397,10 +5437,22 @@ static int decode_exchange_id(struct xdr_stream *xdr,
res->seqid = be32_to_cpup(p++);
res->flags = be32_to_cpup(p++);
/* We ask for SP4_NONE */
dummy = be32_to_cpup(p);
if (dummy != SP4_NONE)
res->state_protect.how = be32_to_cpup(p);
switch (res->state_protect.how) {
case SP4_NONE:
break;
case SP4_MACH_CRED:
status = decode_op_map(xdr, &res->state_protect.enforce);
if (status)
return status;
status = decode_op_map(xdr, &res->state_protect.allow);
if (status)
return status;
break;
default:
WARN_ON_ONCE(1);
return -EIO;
}
/* server_owner4.so_minor_id */
p = xdr_inline_decode(xdr, 8);

4
include/linux/nfs_fs_sb.h
View File

@ -90,6 +90,10 @@ struct nfs_client {
struct nfs41_server_owner *cl_serverowner;
struct nfs41_server_scope *cl_serverscope;
struct nfs41_impl_id *cl_implid;
/* nfs 4.1+ state protection modes: */
unsigned long cl_sp4_flags;
#define NFS_SP4_MACH_CRED_MINIMAL 1 /* Minimal sp4_mach_cred - state ops
* must use machine cred */
#endif /* CONFIG_NFS_V4 */
#ifdef CONFIG_NFS_FSCACHE

19
include/linux/nfs_xdr.h
View File

@ -1107,6 +1107,23 @@ struct pnfs_ds_commit_info {
struct pnfs_commit_bucket *buckets;
};
#define NFS4_OP_MAP_NUM_LONGS \
DIV_ROUND_UP(LAST_NFS4_OP, 8 * sizeof(unsigned long))
#define NFS4_OP_MAP_NUM_WORDS \
(NFS4_OP_MAP_NUM_LONGS * sizeof(unsigned long) / sizeof(u32))
struct nfs4_op_map {
union {
unsigned long longs[NFS4_OP_MAP_NUM_LONGS];
u32 words[NFS4_OP_MAP_NUM_WORDS];
} u;
};
struct nfs41_state_protection {
u32 how;
struct nfs4_op_map enforce;
struct nfs4_op_map allow;
};
#define NFS4_EXCHANGE_ID_LEN (48)
struct nfs41_exchange_id_args {
struct nfs_client *client;
@ -1114,6 +1131,7 @@ struct nfs41_exchange_id_args {
unsigned int id_len;
char id[NFS4_EXCHANGE_ID_LEN];
u32 flags;
struct nfs41_state_protection state_protect;
};
struct nfs41_server_owner {
@ -1146,6 +1164,7 @@ struct nfs41_exchange_id_res {
struct nfs41_server_owner *server_owner;
struct nfs41_server_scope *server_scope;
struct nfs41_impl_id *impl_id;
struct nfs41_state_protection state_protect;
};
struct nfs41_create_session_args {