From 2031cd1af143f47dacacbb35efbef22f2fd079e6 Mon Sep 17 00:00:00 2001 From: Weston Andros Adamson Date: Tue, 13 Aug 2013 16:37:32 -0400 Subject: 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 Signed-off-by: Trond Myklebust --- fs/nfs/nfs4proc.c | 133 +++++++++++++++++++++++++++++++++++++++++++++++++++--- fs/nfs/nfs4xdr.c | 72 +++++++++++++++++++++++++---- 2 files changed, 188 insertions(+), 17 deletions(-) (limited to 'fs/nfs') diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 535011a27415..ab6ee1dffd7b 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -6117,16 +6117,87 @@ out: } /* - * nfs4_proc_exchange_id() + * Minimum set of SP4_MACH_CRED operations from RFC 5661 + */ +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 zero, a negative errno, or a negative NFS4ERR status code. + * 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() * - * 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. + * Wrapper for EXCHANGE_ID operation. */ -int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred) +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) { diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c index cb5f94640be6..fbdad9e1719f 100644 --- a/fs/nfs/nfs4xdr.c +++ b/fs/nfs/nfs4xdr.c @@ -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); -- cgit v1.2.3