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author | dfr <dfr@FreeBSD.org> | 2008-11-03 10:38:00 +0000 |
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committer | dfr <dfr@FreeBSD.org> | 2008-11-03 10:38:00 +0000 |
commit | 2fb03513fc4b5d35a398f1ceb4b439fe4bb5fb74 (patch) | |
tree | c59f88924c0b3ead68523ce14806894836f8d9a7 /sys/rpc/svc_auth.c | |
parent | 8b86595849b35ac7c26977f1b8206c1678c9b5bb (diff) | |
download | FreeBSD-src-2fb03513fc4b5d35a398f1ceb4b439fe4bb5fb74.zip FreeBSD-src-2fb03513fc4b5d35a398f1ceb4b439fe4bb5fb74.tar.gz |
Implement support for RPCSEC_GSS authentication to both the NFS client
and server. This replaces the RPC implementation of the NFS client and
server with the newer RPC implementation originally developed
(actually ported from the userland sunrpc code) to support the NFS
Lock Manager. I have tested this code extensively and I believe it is
stable and that performance is at least equal to the legacy RPC
implementation.
The NFS code currently contains support for both the new RPC
implementation and the older legacy implementation inherited from the
original NFS codebase. The default is to use the new implementation -
add the NFS_LEGACYRPC option to fall back to the old code. When I
merge this support back to RELENG_7, I will probably change this so
that users have to 'opt in' to get the new code.
To use RPCSEC_GSS on either client or server, you must build a kernel
which includes the KGSSAPI option and the crypto device. On the
userland side, you must build at least a new libc, mountd, mount_nfs
and gssd. You must install new versions of /etc/rc.d/gssd and
/etc/rc.d/nfsd and add 'gssd_enable=YES' to /etc/rc.conf.
As long as gssd is running, you should be able to mount an NFS
filesystem from a server that requires RPCSEC_GSS authentication. The
mount itself can happen without any kerberos credentials but all
access to the filesystem will be denied unless the accessing user has
a valid ticket file in the standard place (/tmp/krb5cc_<uid>). There
is currently no support for situations where the ticket file is in a
different place, such as when the user logged in via SSH and has
delegated credentials from that login. This restriction is also
present in Solaris and Linux. In theory, we could improve this in
future, possibly using Brooks Davis' implementation of variant
symlinks.
Supporting RPCSEC_GSS on a server is nearly as simple. You must create
service creds for the server in the form 'nfs/<fqdn>@<REALM>' and
install them in /etc/krb5.keytab. The standard heimdal utility ktutil
makes this fairly easy. After the service creds have been created, you
can add a '-sec=krb5' option to /etc/exports and restart both mountd
and nfsd.
The only other difference an administrator should notice is that nfsd
doesn't fork to create service threads any more. In normal operation,
there will be two nfsd processes, one in userland waiting for TCP
connections and one in the kernel handling requests. The latter
process will create as many kthreads as required - these should be
visible via 'top -H'. The code has some support for varying the number
of service threads according to load but initially at least, nfsd uses
a fixed number of threads according to the value supplied to its '-n'
option.
Sponsored by: Isilon Systems
MFC after: 1 month
Diffstat (limited to 'sys/rpc/svc_auth.c')
-rw-r--r-- | sys/rpc/svc_auth.c | 75 |
1 files changed, 69 insertions, 6 deletions
diff --git a/sys/rpc/svc_auth.c b/sys/rpc/svc_auth.c index 22d4e61..6d5a79b 100644 --- a/sys/rpc/svc_auth.c +++ b/sys/rpc/svc_auth.c @@ -52,6 +52,13 @@ __FBSDID("$FreeBSD$"); #include <rpc/rpc.h> +static enum auth_stat (*_svcauth_rpcsec_gss)(struct svc_req *, + struct rpc_msg *) = NULL; +static int (*_svcauth_rpcsec_gss_getcred)(struct svc_req *, + struct ucred **, int *); + +static struct svc_auth_ops svc_auth_null_ops; + /* * The call rpc message, msg has been obtained from the wire. The msg contains * the raw form of credentials and verifiers. authenticate returns AUTH_OK @@ -77,8 +84,8 @@ _authenticate(struct svc_req *rqst, struct rpc_msg *msg) enum auth_stat dummy; rqst->rq_cred = msg->rm_call.cb_cred; - rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor; - rqst->rq_xprt->xp_verf.oa_length = 0; + rqst->rq_auth.svc_ah_ops = &svc_auth_null_ops; + rqst->rq_auth.svc_ah_private = NULL; cred_flavor = rqst->rq_cred.oa_flavor; switch (cred_flavor) { case AUTH_NULL: @@ -90,6 +97,11 @@ _authenticate(struct svc_req *rqst, struct rpc_msg *msg) case AUTH_SHORT: dummy = _svcauth_short(rqst, msg); return (dummy); + case RPCSEC_GSS: + if (!_svcauth_rpcsec_gss) + return (AUTH_REJECTEDCRED); + dummy = _svcauth_rpcsec_gss(rqst, msg); + return (dummy); default: break; } @@ -97,21 +109,65 @@ _authenticate(struct svc_req *rqst, struct rpc_msg *msg) return (AUTH_REJECTEDCRED); } +/* + * A set of null auth methods used by any authentication protocols + * that don't need to inspect or modify the message body. + */ +static bool_t +svcauth_null_wrap(SVCAUTH *auth, struct mbuf **mp) +{ + + return (TRUE); +} + +static bool_t +svcauth_null_unwrap(SVCAUTH *auth, struct mbuf **mp) +{ + + return (TRUE); +} + +static void +svcauth_null_release(SVCAUTH *auth) +{ + +} + +static struct svc_auth_ops svc_auth_null_ops = { + svcauth_null_wrap, + svcauth_null_unwrap, + svcauth_null_release, +}; + /*ARGSUSED*/ enum auth_stat _svcauth_null(struct svc_req *rqst, struct rpc_msg *msg) { + + rqst->rq_verf = _null_auth; return (AUTH_OK); } int -svc_getcred(struct svc_req *rqst, struct ucred *cr, int *flavorp) +svc_auth_reg(int flavor, + enum auth_stat (*svcauth)(struct svc_req *, struct rpc_msg *), + int (*getcred)(struct svc_req *, struct ucred **, int *)) { + + if (flavor == RPCSEC_GSS) { + _svcauth_rpcsec_gss = svcauth; + _svcauth_rpcsec_gss_getcred = getcred; + } + return (TRUE); +} + +int +svc_getcred(struct svc_req *rqst, struct ucred **crp, int *flavorp) +{ + struct ucred *cr = NULL; int flavor, i; struct xucred *xcr; - KASSERT(!crshared(cr), ("svc_getcred with shared cred")); - flavor = rqst->rq_cred.oa_flavor; if (flavorp) *flavorp = flavor; @@ -119,13 +175,20 @@ svc_getcred(struct svc_req *rqst, struct ucred *cr, int *flavorp) switch (flavor) { case AUTH_UNIX: xcr = (struct xucred *) rqst->rq_clntcred; + cr = crget(); cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xcr->cr_uid; cr->cr_ngroups = xcr->cr_ngroups; for (i = 0; i < xcr->cr_ngroups; i++) cr->cr_groups[i] = xcr->cr_groups[i]; - cr->cr_rgid = cr->cr_groups[0]; + cr->cr_rgid = cr->cr_svgid = cr->cr_groups[0]; + *crp = cr; return (TRUE); + case RPCSEC_GSS: + if (!_svcauth_rpcsec_gss_getcred) + return (FALSE); + return (_svcauth_rpcsec_gss_getcred(rqst, crp, flavorp)); + default: return (FALSE); } |