Author: rmacklem
Date: Tue Jul 9 01:05:28 2013
New Revision: 253049
URL: http://svnweb.freebsd.org/changeset/base/253049
Log:
Add support for host-based (Kerberos 5 service principal) initiator
credentials to the kernel rpc. Modify the NFSv4 client to add
support for the gssname and allgssname mount options to use this
capability. Requires the gssd daemon to be running with the "-h" option.
Reviewed by: jhb
Modified:
head/sys/fs/nfs/nfs.h
head/sys/fs/nfs/nfs_commonkrpc.c
head/sys/fs/nfsclient/nfs_clvfsops.c
head/sys/kgssapi/gss_impl.c
head/sys/rpc/rpcsec_gss.h
head/sys/rpc/rpcsec_gss/rpcsec_gss.c
head/sys/sys/param.h
Modified: head/sys/fs/nfs/nfs.h
==============================================================================
--- head/sys/fs/nfs/nfs.h Mon Jul 8 21:25:12 2013 (r253048)
+++ head/sys/fs/nfs/nfs.h Tue Jul 9 01:05:28 2013 (r253049)
@@ -466,6 +466,7 @@ struct nfssockreq {
u_int32_t nr_prog;
u_int32_t nr_vers;
struct __rpc_client *nr_client;
+ AUTH *nr_auth;
};
/*
Modified: head/sys/fs/nfs/nfs_commonkrpc.c
==============================================================================
--- head/sys/fs/nfs/nfs_commonkrpc.c Mon Jul 8 21:25:12 2013
(r253048)
+++ head/sys/fs/nfs/nfs_commonkrpc.c Tue Jul 9 01:05:28 2013
(r253049)
@@ -102,7 +102,6 @@ static int nfs_bufpackets = 4;
static int nfs_reconnects;
static int nfs3_jukebox_delay = 10;
static int nfs_skip_wcc_data_onerr = 1;
-static int nfs_keytab_enctype = ETYPE_DES_CBC_CRC;
SYSCTL_DECL(_vfs_nfs);
@@ -114,8 +113,6 @@ SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs3_juke
"Number of seconds to delay a retry after receiving EJUKEBOX");
SYSCTL_INT(_vfs_nfs, OID_AUTO, skip_wcc_data_onerr, CTLFLAG_RW,
&nfs_skip_wcc_data_onerr, 0,
"Disable weak cache consistency checking when server returns an error");
-SYSCTL_INT(_vfs_nfs, OID_AUTO, keytab_enctype, CTLFLAG_RW,
&nfs_keytab_enctype, 0,
- "Encryption type for the keytab entry used by nfs");
static void nfs_down(struct nfsmount *, struct thread *, const char *,
int, int);
@@ -393,9 +390,6 @@ nfs_getauth(struct nfssockreq *nrp, int
{
rpc_gss_service_t svc;
AUTH *auth;
-#ifdef notyet
- rpc_gss_options_req_t req_options;
-#endif
switch (secflavour) {
case RPCSEC_GSS_KRB5:
@@ -411,28 +405,16 @@ nfs_getauth(struct nfssockreq *nrp, int
svc = rpc_gss_svc_integrity;
else
svc = rpc_gss_svc_privacy;
-#ifdef notyet
- req_options.req_flags = GSS_C_MUTUAL_FLAG;
- req_options.time_req = 0;
- req_options.my_cred = GSS_C_NO_CREDENTIAL;
- req_options.input_channel_bindings = NULL;
- req_options.enc_type = nfs_keytab_enctype;
-
- auth = rpc_gss_secfind_call(nrp->nr_client, cred,
- clnt_principal, srv_principal, mech_oid, svc,
- &req_options);
-#else
- /*
- * Until changes to the rpcsec_gss code are committed,
- * there is no support for host based initiator
- * principals. As such, that case cannot yet be handled.
- */
+
if (clnt_principal == NULL)
auth = rpc_gss_secfind_call(nrp->nr_client, cred,
srv_principal, mech_oid, svc);
- else
- auth = NULL;
-#endif
+ else {
+ auth = rpc_gss_seccreate_call(nrp->nr_client, cred,
+ clnt_principal, srv_principal, "kerberosv5",
+ svc, NULL, NULL, NULL);
+ return (auth);
+ }
if (auth != NULL)
return (auth);
/* fallthrough */
@@ -505,7 +487,7 @@ newnfs_request(struct nfsrv_descript *nd
struct rpc_callextra ext;
enum clnt_stat stat;
struct nfsreq *rep = NULL;
- char *srv_principal = NULL;
+ char *srv_principal = NULL, *clnt_principal = NULL;
sigset_t oldset;
struct ucred *authcred;
@@ -568,6 +550,7 @@ newnfs_request(struct nfsrv_descript *nd
*/
if (nmp->nm_krbnamelen > 0) {
usegssname = 1;
+ clnt_principal = nmp->nm_krbname;
} else if (nmp->nm_uid != (uid_t)-1) {
KASSERT(nmp->nm_sockreq.nr_cred != NULL,
("newnfs_request: NULL nr_cred"));
@@ -622,10 +605,19 @@ newnfs_request(struct nfsrv_descript *nd
if (nd->nd_procnum == NFSPROC_NULL)
auth = authnone_create();
- else if (usegssname)
- auth = nfs_getauth(nrp, secflavour, nmp->nm_krbname,
- srv_principal, NULL, authcred);
- else
+ else if (usegssname) {
+ /*
+ * For this case, the authenticator is held in the
+ * nfssockreq structure, so don't release the reference count
+ * held on it. --> Don't AUTH_DESTROY() it in this function.
+ */
+ if (nrp->nr_auth == NULL)
+ nrp->nr_auth = nfs_getauth(nrp, secflavour,
+ clnt_principal, srv_principal, NULL, authcred);
+ else
+ rpc_gss_refresh_auth_call(nrp->nr_auth);
+ auth = nrp->nr_auth;
+ } else
auth = nfs_getauth(nrp, secflavour, NULL,
srv_principal, NULL, authcred);
crfree(authcred);
@@ -781,7 +773,8 @@ tryagain:
}
if (error) {
m_freem(nd->nd_mreq);
- AUTH_DESTROY(auth);
+ if (usegssname == 0)
+ AUTH_DESTROY(auth);
if (rep != NULL)
FREE((caddr_t)rep, M_NFSDREQ);
if (set_sigset)
@@ -991,7 +984,8 @@ tryagain:
#endif
m_freem(nd->nd_mreq);
- AUTH_DESTROY(auth);
+ if (usegssname == 0)
+ AUTH_DESTROY(auth);
if (rep != NULL)
FREE((caddr_t)rep, M_NFSDREQ);
if (set_sigset)
@@ -1000,7 +994,8 @@ tryagain:
nfsmout:
mbuf_freem(nd->nd_mrep);
mbuf_freem(nd->nd_mreq);
- AUTH_DESTROY(auth);
+ if (usegssname == 0)
+ AUTH_DESTROY(auth);
if (rep != NULL)
FREE((caddr_t)rep, M_NFSDREQ);
if (set_sigset)
Modified: head/sys/fs/nfsclient/nfs_clvfsops.c
==============================================================================
--- head/sys/fs/nfsclient/nfs_clvfsops.c Mon Jul 8 21:25:12 2013
(r253048)
+++ head/sys/fs/nfsclient/nfs_clvfsops.c Tue Jul 9 01:05:28 2013
(r253049)
@@ -1446,6 +1446,8 @@ bad:
nfscl_clientrelease(clp);
newnfs_disconnect(&nmp->nm_sockreq);
crfree(nmp->nm_sockreq.nr_cred);
+ if (nmp->nm_sockreq.nr_auth != NULL)
+ AUTH_DESTROY(nmp->nm_sockreq.nr_auth);
mtx_destroy(&nmp->nm_sockreq.nr_mtx);
mtx_destroy(&nmp->nm_mtx);
if (nmp->nm_clp != NULL) {
@@ -1516,7 +1518,8 @@ nfs_unmount(struct mount *mp, int mntfla
newnfs_disconnect(&nmp->nm_sockreq);
crfree(nmp->nm_sockreq.nr_cred);
FREE(nmp->nm_nam, M_SONAME);
-
+ if (nmp->nm_sockreq.nr_auth != NULL)
+ AUTH_DESTROY(nmp->nm_sockreq.nr_auth);
mtx_destroy(&nmp->nm_sockreq.nr_mtx);
mtx_destroy(&nmp->nm_mtx);
TAILQ_FOREACH_SAFE(dsp, &nmp->nm_sess, nfsclds_list, tdsp)
Modified: head/sys/kgssapi/gss_impl.c
==============================================================================
--- head/sys/kgssapi/gss_impl.c Mon Jul 8 21:25:12 2013 (r253048)
+++ head/sys/kgssapi/gss_impl.c Tue Jul 9 01:05:28 2013 (r253049)
@@ -286,6 +286,7 @@ kgssapi_modevent(module_t mod, int type,
switch (type) {
case MOD_LOAD:
+ rpc_gss_entries.rpc_gss_refresh_auth = rpc_gss_refresh_auth;
rpc_gss_entries.rpc_gss_secfind = rpc_gss_secfind;
rpc_gss_entries.rpc_gss_secpurge = rpc_gss_secpurge;
rpc_gss_entries.rpc_gss_seccreate = rpc_gss_seccreate;
Modified: head/sys/rpc/rpcsec_gss.h
==============================================================================
--- head/sys/rpc/rpcsec_gss.h Mon Jul 8 21:25:12 2013 (r253048)
+++ head/sys/rpc/rpcsec_gss.h Tue Jul 9 01:05:28 2013 (r253049)
@@ -153,9 +153,9 @@ typedef AUTH *rpc_gss_secfind_ftype(CLIE
rpc_gss_service_t service);
typedef void rpc_gss_secpurge_ftype(CLIENT *clnt);
typedef AUTH *rpc_gss_seccreate_ftype(CLIENT *clnt, struct ucred *cred,
- const char *principal, const char *mechanism,
- rpc_gss_service_t service, const char *qop,
- rpc_gss_options_req_t *options_req,
+ const char *clnt_principal, const char *principal,
+ const char *mechanism, rpc_gss_service_t service,
+ const char *qop, rpc_gss_options_req_t *options_req,
rpc_gss_options_ret_t *options_ret);
typedef bool_t rpc_gss_set_defaults_ftype(AUTH *auth,
rpc_gss_service_t service, const char *qop);
@@ -183,6 +183,7 @@ typedef bool_t rpc_gss_get_principal_nam
const char *domain);
typedef int rpc_gss_svc_max_data_length_ftype(struct svc_req *req,
int max_tp_unit_len);
+typedef void rpc_gss_refresh_auth_ftype(AUTH *auth);
struct rpc_gss_entries {
rpc_gss_secfind_ftype *rpc_gss_secfind;
@@ -204,6 +205,7 @@ struct rpc_gss_entries {
rpc_gss_clear_callback_ftype *rpc_gss_clear_callback;
rpc_gss_get_principal_name_ftype *rpc_gss_get_principal_name;
rpc_gss_svc_max_data_length_ftype *rpc_gss_svc_max_data_length;
+ rpc_gss_refresh_auth_ftype *rpc_gss_refresh_auth;
};
extern struct rpc_gss_entries rpc_gss_entries;
@@ -229,16 +231,17 @@ rpc_gss_secpurge_call(CLIENT *clnt)
}
static __inline AUTH *
-rpc_gss_seccreate_call(CLIENT *clnt, struct ucred *cred, const char *principal,
- const char *mechanism, rpc_gss_service_t service, const char *qop,
+rpc_gss_seccreate_call(CLIENT *clnt, struct ucred *cred,
+ const char *clnt_principal, const char *principal, const char *mechanism,
+ rpc_gss_service_t service, const char *qop,
rpc_gss_options_req_t *options_req, rpc_gss_options_ret_t *options_ret)
{
AUTH *ret = NULL;
if (rpc_gss_entries.rpc_gss_seccreate != NULL)
ret = (*rpc_gss_entries.rpc_gss_seccreate)(clnt, cred,
- principal, mechanism, service, qop, options_req,
- options_ret);
+ clnt_principal, principal, mechanism, service, qop,
+ options_req, options_ret);
return (ret);
}
@@ -406,14 +409,29 @@ rpc_gss_svc_max_data_length_call(struct
return (ret);
}
+static __inline void
+rpc_gss_refresh_auth_call(AUTH *auth)
+{
+
+ if (rpc_gss_entries.rpc_gss_refresh_auth != NULL)
+ (*rpc_gss_entries.rpc_gss_refresh_auth)(auth);
+}
+
AUTH *rpc_gss_secfind(CLIENT *clnt, struct ucred *cred,
const char *principal, gss_OID mech_oid, rpc_gss_service_t service);
void rpc_gss_secpurge(CLIENT *clnt);
-#endif
+void rpc_gss_refresh_auth(AUTH *auth);
+AUTH *rpc_gss_seccreate(CLIENT *clnt, struct ucred *cred,
+ const char *clnt_principal, const char *principal,
+ const char *mechanism, rpc_gss_service_t service,
+ const char *qop, rpc_gss_options_req_t *options_req,
+ rpc_gss_options_ret_t *options_ret);
+#else /* !_KERNEL */
AUTH *rpc_gss_seccreate(CLIENT *clnt, struct ucred *cred,
const char *principal, const char *mechanism, rpc_gss_service_t service,
const char *qop, rpc_gss_options_req_t *options_req,
rpc_gss_options_ret_t *options_ret);
+#endif /* _KERNEL */
bool_t rpc_gss_set_defaults(AUTH *auth, rpc_gss_service_t service,
const char *qop);
int rpc_gss_max_data_length(AUTH *handle, int max_tp_unit_len);
Modified: head/sys/rpc/rpcsec_gss/rpcsec_gss.c
==============================================================================
--- head/sys/rpc/rpcsec_gss/rpcsec_gss.c Mon Jul 8 21:25:12 2013
(r253048)
+++ head/sys/rpc/rpcsec_gss/rpcsec_gss.c Tue Jul 9 01:05:28 2013
(r253049)
@@ -82,6 +82,8 @@ __FBSDID("$FreeBSD$");
#include <rpc/rpc.h>
#include <rpc/rpcsec_gss.h>
+#include <kgssapi/krb5/kcrypto.h>
+
#include "rpcsec_gss_int.h"
static void rpc_gss_nextverf(AUTH*);
@@ -122,6 +124,7 @@ struct rpc_gss_data {
AUTH *gd_auth; /* link back to AUTH */
struct ucred *gd_ucred; /* matching local cred */
char *gd_principal; /* server principal name */
+ char *gd_clntprincipal; /* client principal name */
rpc_gss_options_req_t gd_options; /* GSS context options */
enum rpcsec_gss_state gd_state; /* connection state */
gss_buffer_desc gd_verf; /* save GSS_S_COMPLETE
@@ -153,7 +156,7 @@ static struct sx rpc_gss_lock;
static int rpc_gss_count;
static AUTH *rpc_gss_seccreate_int(CLIENT *, struct ucred *, const char *,
- gss_OID, rpc_gss_service_t, u_int, rpc_gss_options_req_t *,
+ const char *, gss_OID, rpc_gss_service_t, u_int, rpc_gss_options_req_t *,
rpc_gss_options_ret_t *);
static void
@@ -251,8 +254,8 @@ again:
/*
* We missed in the cache - create a new association.
*/
- auth = rpc_gss_seccreate_int(clnt, cred, principal, mech_oid, service,
- GSS_C_QOP_DEFAULT, NULL, NULL);
+ auth = rpc_gss_seccreate_int(clnt, cred, NULL, principal, mech_oid,
+ service, GSS_C_QOP_DEFAULT, NULL, NULL);
if (!auth)
return (NULL);
@@ -304,9 +307,10 @@ rpc_gss_secpurge(CLIENT *clnt)
}
AUTH *
-rpc_gss_seccreate(CLIENT *clnt, struct ucred *cred, const char *principal,
- const char *mechanism, rpc_gss_service_t service, const char *qop,
- rpc_gss_options_req_t *options_req, rpc_gss_options_ret_t *options_ret)
+rpc_gss_seccreate(CLIENT *clnt, struct ucred *cred, const char *clnt_principal,
+ const char *principal, const char *mechanism, rpc_gss_service_t service,
+ const char *qop, rpc_gss_options_req_t *options_req,
+ rpc_gss_options_ret_t *options_ret)
{
gss_OID oid;
u_int qop_num;
@@ -324,13 +328,33 @@ rpc_gss_seccreate(CLIENT *clnt, struct u
qop_num = GSS_C_QOP_DEFAULT;
}
- return (rpc_gss_seccreate_int(clnt, cred, principal, oid, service,
- qop_num, options_req, options_ret));
+ return (rpc_gss_seccreate_int(clnt, cred, clnt_principal, principal,
+ oid, service, qop_num, options_req, options_ret));
+}
+
+void
+rpc_gss_refresh_auth(AUTH *auth)
+{
+ struct rpc_gss_data *gd;
+ rpc_gss_options_ret_t options;
+
+ gd = AUTH_PRIVATE(auth);
+ /*
+ * If the state != ESTABLISHED, try and initialize
+ * the authenticator again. This will happen if the
+ * user's credentials have expired. It may succeed now,
+ * if they have done a kinit or similar.
+ */
+ if (gd->gd_state != RPCSEC_GSS_ESTABLISHED) {
+ memset(&options, 0, sizeof (options));
+ (void) rpc_gss_init(auth, &options);
+ }
}
static AUTH *
-rpc_gss_seccreate_int(CLIENT *clnt, struct ucred *cred, const char *principal,
- gss_OID mech_oid, rpc_gss_service_t service, u_int qop_num,
+rpc_gss_seccreate_int(CLIENT *clnt, struct ucred *cred,
+ const char *clnt_principal, const char *principal, gss_OID mech_oid,
+ rpc_gss_service_t service, u_int qop_num,
rpc_gss_options_req_t *options_req, rpc_gss_options_ret_t *options_ret)
{
AUTH *auth;
@@ -379,6 +403,10 @@ rpc_gss_seccreate_int(CLIENT *clnt, stru
gd->gd_auth = auth;
gd->gd_ucred = crdup(cred);
gd->gd_principal = strdup(principal, M_RPC);
+ if (clnt_principal != NULL)
+ gd->gd_clntprincipal = strdup(clnt_principal, M_RPC);
+ else
+ gd->gd_clntprincipal = NULL;
if (options_req) {
@@ -719,6 +747,8 @@ rpc_gss_init(AUTH *auth, rpc_gss_options
OM_uint32 maj_stat, min_stat, call_stat;
const char *mech;
struct rpc_callextra ext;
+ gss_OID mech_oid;
+ gss_OID_set mechlist;
rpc_gss_log_debug("in rpc_gss_refresh()");
@@ -745,6 +775,65 @@ rpc_gss_init(AUTH *auth, rpc_gss_options
gd->gd_cred.gc_proc = RPCSEC_GSS_INIT;
gd->gd_cred.gc_seq = 0;
+ /*
+ * For KerberosV, if there is a client principal name, that implies
+ * that this is a host based initiator credential in the default
+ * keytab file. For this case, it is necessary to do a
+ * gss_acquire_cred(). When this is done, the gssd daemon will
+ * do the equivalent of "kinit -k" to put a TGT for the name in
+ * the credential cache file for the gssd daemon.
+ */
+ if (gd->gd_clntprincipal != NULL &&
+ rpc_gss_mech_to_oid("kerberosv5", &mech_oid) &&
+ gd->gd_mech == mech_oid) {
+ /* Get rid of any old credential. */
+ if (gd->gd_options.my_cred != GSS_C_NO_CREDENTIAL) {
+ gss_release_cred(&min_stat, &gd->gd_options.my_cred);
+ gd->gd_options.my_cred = GSS_C_NO_CREDENTIAL;
+ }
+
+ /*
+ * The mechanism must be set to KerberosV for acquisition
+ * of credentials to work reliably.
+ */
+ maj_stat = gss_create_empty_oid_set(&min_stat, &mechlist);
+ if (maj_stat != GSS_S_COMPLETE) {
+ options_ret->major_status = maj_stat;
+ options_ret->minor_status = min_stat;
+ goto out;
+ }
+ maj_stat = gss_add_oid_set_member(&min_stat, gd->gd_mech,
+ &mechlist);
+ if (maj_stat != GSS_S_COMPLETE) {
+ options_ret->major_status = maj_stat;
+ options_ret->minor_status = min_stat;
+ gss_release_oid_set(&min_stat, &mechlist);
+ goto out;
+ }
+
+ principal_desc.value = (void *)gd->gd_clntprincipal;
+ principal_desc.length = strlen(gd->gd_clntprincipal);
+ maj_stat = gss_import_name(&min_stat, &principal_desc,
+ GSS_C_NT_HOSTBASED_SERVICE, &name);
+ if (maj_stat != GSS_S_COMPLETE) {
+ options_ret->major_status = maj_stat;
+ options_ret->minor_status = min_stat;
+ gss_release_oid_set(&min_stat, &mechlist);
+ goto out;
+ }
+ /* Acquire the credentials. */
+ maj_stat = gss_acquire_cred(&min_stat, name, 0,
+ mechlist, GSS_C_INITIATE,
+ &gd->gd_options.my_cred, NULL, NULL);
+ gss_release_name(&min_stat, &name);
+ gss_release_oid_set(&min_stat, &mechlist);
+ if (maj_stat != GSS_S_COMPLETE) {
+ options_ret->major_status = maj_stat;
+ options_ret->minor_status = min_stat;
+ goto out;
+ }
+ }
+
principal_desc.value = (void *)gd->gd_principal;
principal_desc.length = strlen(gd->gd_principal);
maj_stat = gss_import_name(&min_stat, &principal_desc,
@@ -1036,6 +1125,8 @@ rpc_gss_destroy(AUTH *auth)
CLNT_RELEASE(gd->gd_clnt);
crfree(gd->gd_ucred);
free(gd->gd_principal, M_RPC);
+ if (gd->gd_clntprincipal != NULL)
+ free(gd->gd_clntprincipal, M_RPC);
if (gd->gd_verf.value)
xdr_free((xdrproc_t) xdr_gss_buffer_desc,
(char *) &gd->gd_verf);
Modified: head/sys/sys/param.h
==============================================================================
--- head/sys/sys/param.h Mon Jul 8 21:25:12 2013 (r253048)
+++ head/sys/sys/param.h Tue Jul 9 01:05:28 2013 (r253049)
@@ -58,7 +58,7 @@
* in the range 5 to 9.
*/
#undef __FreeBSD_version
-#define __FreeBSD_version 1000035 /* Master, propagated to newvers */
+#define __FreeBSD_version 1000036 /* Master, propagated to newvers */
/*
* __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,
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