From 83523d083a045a2069e5f3443d2e4f810a6e6d9a Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Sat, 16 Mar 2013 15:55:01 -0400 Subject: [PATCH] SUNRPC: Consider qop when looking up pseudoflavors The NFSv4 SECINFO operation returns a list of security flavors that the server supports for a particular share. An NFSv4 client is supposed to pick a pseudoflavor it supports that corresponds to one of the flavors returned by the server. GSS flavors in this list have a GSS tuple that identify a specific GSS pseudoflavor. Currently our client ignores the GSS tuple's "qop" value. A matching pseudoflavor is chosen based only on the OID and service value. So far this omission has not had much effect on Linux. The NFSv4 protocol currently supports only one qop value: GSS_C_QOP_DEFAULT, also known as zero. However, if an NFSv4 server happens to return something other than zero in the qop field, our client won't notice. This could cause the client to behave in incorrect ways that could have security implications. Signed-off-by: Chuck Lever Signed-off-by: Trond Myklebust --- include/linux/sunrpc/gss_api.h | 5 ++++- net/sunrpc/auth_gss/gss_krb5_mech.c | 3 +++ net/sunrpc/auth_gss/gss_mech_switch.c | 20 ++++++++++++++------ net/sunrpc/auth_gss/svcauth_gss.c | 4 +++- 4 files changed, 24 insertions(+), 8 deletions(-) diff --git a/include/linux/sunrpc/gss_api.h b/include/linux/sunrpc/gss_api.h index aba7687ca884..96e5a81a54d7 100644 --- a/include/linux/sunrpc/gss_api.h +++ b/include/linux/sunrpc/gss_api.h @@ -25,6 +25,7 @@ struct gss_ctx { #define GSS_C_NO_BUFFER ((struct xdr_netobj) 0) #define GSS_C_NO_CONTEXT ((struct gss_ctx *) 0) +#define GSS_C_QOP_DEFAULT (0) /*XXX arbitrary length - is this set somewhere? */ #define GSS_OID_MAX_LEN 32 @@ -68,12 +69,14 @@ u32 gss_unwrap( u32 gss_delete_sec_context( struct gss_ctx **ctx_id); -u32 gss_svc_to_pseudoflavor(struct gss_api_mech *, u32 service); +rpc_authflavor_t gss_svc_to_pseudoflavor(struct gss_api_mech *, u32 qop, + u32 service); u32 gss_pseudoflavor_to_service(struct gss_api_mech *, u32 pseudoflavor); char *gss_service_to_auth_domain_name(struct gss_api_mech *, u32 service); struct pf_desc { u32 pseudoflavor; + u32 qop; u32 service; char *name; char *auth_domain_name; diff --git a/net/sunrpc/auth_gss/gss_krb5_mech.c b/net/sunrpc/auth_gss/gss_krb5_mech.c index b822ec5cdc58..33255ff889c0 100644 --- a/net/sunrpc/auth_gss/gss_krb5_mech.c +++ b/net/sunrpc/auth_gss/gss_krb5_mech.c @@ -729,16 +729,19 @@ static const struct gss_api_ops gss_kerberos_ops = { static struct pf_desc gss_kerberos_pfs[] = { [0] = { .pseudoflavor = RPC_AUTH_GSS_KRB5, + .qop = GSS_C_QOP_DEFAULT, .service = RPC_GSS_SVC_NONE, .name = "krb5", }, [1] = { .pseudoflavor = RPC_AUTH_GSS_KRB5I, + .qop = GSS_C_QOP_DEFAULT, .service = RPC_GSS_SVC_INTEGRITY, .name = "krb5i", }, [2] = { .pseudoflavor = RPC_AUTH_GSS_KRB5P, + .qop = GSS_C_QOP_DEFAULT, .service = RPC_GSS_SVC_PRIVACY, .name = "krb5p", }, diff --git a/net/sunrpc/auth_gss/gss_mech_switch.c b/net/sunrpc/auth_gss/gss_mech_switch.c index 92a72404e6d5..81fb6f3e2424 100644 --- a/net/sunrpc/auth_gss/gss_mech_switch.c +++ b/net/sunrpc/auth_gss/gss_mech_switch.c @@ -271,19 +271,27 @@ int gss_mech_list_pseudoflavors(rpc_authflavor_t *array_ptr, int size) return i; } -u32 -gss_svc_to_pseudoflavor(struct gss_api_mech *gm, u32 service) +/** + * gss_svc_to_pseudoflavor - map a GSS service number to a pseudoflavor + * @gm: GSS mechanism handle + * @qop: GSS quality-of-protection value + * @service: GSS service value + * + * Returns a matching security flavor, or RPC_AUTH_MAXFLAVOR if none is found. + */ +rpc_authflavor_t gss_svc_to_pseudoflavor(struct gss_api_mech *gm, u32 qop, + u32 service) { int i; for (i = 0; i < gm->gm_pf_num; i++) { - if (gm->gm_pfs[i].service == service) { + if (gm->gm_pfs[i].qop == qop && + gm->gm_pfs[i].service == service) { return gm->gm_pfs[i].pseudoflavor; } } - return RPC_AUTH_MAXFLAVOR; /* illegal value */ + return RPC_AUTH_MAXFLAVOR; } -EXPORT_SYMBOL_GPL(gss_svc_to_pseudoflavor); /** * gss_mech_info2flavor - look up a pseudoflavor given a GSS tuple @@ -301,7 +309,7 @@ rpc_authflavor_t gss_mech_info2flavor(struct rpcsec_gss_info *info) if (gm == NULL) return RPC_AUTH_MAXFLAVOR; - pseudoflavor = gss_svc_to_pseudoflavor(gm, info->service); + pseudoflavor = gss_svc_to_pseudoflavor(gm, info->qop, info->service); gss_mech_put(gm); return pseudoflavor; diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c index f7d34e7b6f81..74f6d30f5ded 100644 --- a/net/sunrpc/auth_gss/svcauth_gss.c +++ b/net/sunrpc/auth_gss/svcauth_gss.c @@ -1216,7 +1216,9 @@ svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp) svcdata->rsci = rsci; cache_get(&rsci->h); rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor( - rsci->mechctx->mech_type, gc->gc_svc); + rsci->mechctx->mech_type, + GSS_C_QOP_DEFAULT, + gc->gc_svc); ret = SVC_OK; goto out; } -- 2.39.5