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Piete.Brooks at cl.cam.ac.uk reported via email a crash which was

Browse source 
caused by use of an invalid kgss_gssd_handle during an upcall to
the gssd daemon when it has exited. This patch seems to avoid the
crashes by holding a reference count on the kgss_gssd_handle until
the upcall is done. It also adds a new mutex kgss_gssd_lock used to
make manipulation of kgss_gssd_handle SMP safe.

Tested by:	Illias A. Marinos, Herbert Poeckl
Reviewed by:	jhb
MFC after:	2 weeks
This commit is contained in:
Rick Macklem 2012-12-18 00:25:48 +00:00
parent 61ba2ac6b4
commit 13870d5d7b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=244370
14 changed files with 144 additions and 41 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
sys/kgssapi/gss_accept_sec_context.c
View file

@ -31,7 +31,9 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <kgssapi/gssapi.h>
#include <kgssapi/gssapi_impl.h>
@ -58,9 +60,13 @@ OM_uint32 gss_accept_sec_context(OM_uint32 *minor_status,
gss_ctx_id_t ctx = *context_handle;
gss_name_t name;
gss_cred_id_t cred;
CLIENT *cl;
if (!kgss_gssd_handle)
cl = kgss_gssd_client();
if (cl == NULL) {
*minor_status = 0;
return (GSS_S_FAILURE);
}
if (ctx)
args.ctx = ctx->handle;
@ -74,7 +80,8 @@ OM_uint32 gss_accept_sec_context(OM_uint32 *minor_status,
args.input_chan_bindings = input_chan_bindings;
bzero(&res, sizeof(res));
stat = gssd_accept_sec_context_1(&args, &res, kgss_gssd_handle);
stat = gssd_accept_sec_context_1(&args, &res, cl);
CLNT_RELEASE(cl);
if (stat != RPC_SUCCESS) {
*minor_status = stat;
return (GSS_S_FAILURE);

11
sys/kgssapi/gss_acquire_cred.c
View file

@ -31,7 +31,9 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <kgssapi/gssapi.h>
@ -55,8 +57,11 @@ gss_acquire_cred(OM_uint32 *minor_status,
enum clnt_stat stat;
gss_cred_id_t cred;
int i;
CLIENT *cl;
if (!kgss_gssd_handle)
*minor_status = 0;
cl = kgss_gssd_client();
if (cl == NULL)
return (GSS_S_FAILURE);
args.uid = curthread->td_ucred->cr_uid;
@ -69,7 +74,8 @@ gss_acquire_cred(OM_uint32 *minor_status,
args.cred_usage = cred_usage;
bzero(&res, sizeof(res));
stat = gssd_acquire_cred_1(&args, &res, kgss_gssd_handle);
stat = gssd_acquire_cred_1(&args, &res, cl);
CLNT_RELEASE(cl);
if (stat != RPC_SUCCESS) {
*minor_status = stat;
return (GSS_S_FAILURE);
@ -80,7 +86,6 @@ gss_acquire_cred(OM_uint32 *minor_status,
return (res.major_status);
}
*minor_status = 0;
cred = malloc(sizeof(struct _gss_cred_id_t), M_GSSAPI, M_WAITOK);
cred->handle = res.output_cred;
*output_cred_handle = cred;

11
sys/kgssapi/gss_canonicalize_name.c
View file

@ -31,7 +31,9 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <kgssapi/gssapi.h>
#include <kgssapi/gssapi_impl.h>
@ -48,15 +50,19 @@ gss_canonicalize_name(OM_uint32 *minor_status,
struct canonicalize_name_args args;
enum clnt_stat stat;
gss_name_t name;
CLIENT *cl;
if (!kgss_gssd_handle)
*minor_status = 0;
cl = kgss_gssd_client();
if (cl == NULL)
return (GSS_S_FAILURE);
args.input_name = input_name->handle;
args.mech_type = mech_type;
bzero(&res, sizeof(res));
stat = gssd_canonicalize_name_1(&args, &res, kgss_gssd_handle);
stat = gssd_canonicalize_name_1(&args, &res, cl);
CLNT_RELEASE(cl);
if (stat != RPC_SUCCESS) {
*minor_status = stat;
return (GSS_S_FAILURE);
@ -69,7 +75,6 @@ gss_canonicalize_name(OM_uint32 *minor_status,
name = malloc(sizeof(struct _gss_name_t), M_GSSAPI, M_WAITOK);
name->handle = res.output_name;
*minor_status = 0;
*output_name = name;
return (GSS_S_COMPLETE);

13
sys/kgssapi/gss_delete_sec_context.c
View file

@ -31,7 +31,9 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <kgssapi/gssapi.h>
#include <kgssapi/gssapi_impl.h>
@ -46,6 +48,9 @@ gss_delete_sec_context(OM_uint32 *minor_status, gss_ctx_id_t *context_handle,
struct delete_sec_context_args args;
enum clnt_stat stat;
gss_ctx_id_t ctx;
CLIENT *cl;
*minor_status = 0;
if (!kgss_gssd_handle)
return (GSS_S_FAILURE);
@ -60,9 +65,13 @@ gss_delete_sec_context(OM_uint32 *minor_status, gss_ctx_id_t *context_handle,
*/
if (ctx->handle) {
args.ctx = ctx->handle;
cl = kgss_gssd_client();
if (cl == NULL)
return (GSS_S_FAILURE);
bzero(&res, sizeof(res));
stat = gssd_delete_sec_context_1(&args, &res, kgss_gssd_handle);
stat = gssd_delete_sec_context_1(&args, &res, cl);
CLNT_RELEASE(cl);
if (stat != RPC_SUCCESS) {
*minor_status = stat;
return (GSS_S_FAILURE);
@ -85,7 +94,5 @@ gss_delete_sec_context(OM_uint32 *minor_status, gss_ctx_id_t *context_handle,
}
}
*minor_status = 0;
return (GSS_S_COMPLETE);
}

11
sys/kgssapi/gss_display_status.c
View file

@ -31,7 +31,9 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <kgssapi/gssapi.h>
#include <kgssapi/gssapi_impl.h>
@ -49,8 +51,11 @@ gss_display_status(OM_uint32 *minor_status,
struct display_status_res res;
struct display_status_args args;
enum clnt_stat stat;
CLIENT *cl;
if (!kgss_gssd_handle)
*minor_status = 0;
cl = kgss_gssd_client();
if (cl == NULL)
return (GSS_S_FAILURE);
args.status_value = status_value;
@ -59,7 +64,8 @@ gss_display_status(OM_uint32 *minor_status,
args.message_context = *message_context;
bzero(&res, sizeof(res));
stat = gssd_display_status_1(&args, &res, kgss_gssd_handle);
stat = gssd_display_status_1(&args, &res, cl);
CLNT_RELEASE(cl);
if (stat != RPC_SUCCESS) {
*minor_status = stat;
return (GSS_S_FAILURE);
@ -70,7 +76,6 @@ gss_display_status(OM_uint32 *minor_status,
return (res.major_status);
}
*minor_status = 0;
*message_context = res.message_context;
kgss_copy_buffer(&res.status_string, status_string);
xdr_free((xdrproc_t) xdr_display_status_res, &res);

11
sys/kgssapi/gss_export_name.c
View file

@ -31,7 +31,9 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <kgssapi/gssapi.h>
#include <kgssapi/gssapi_impl.h>
@ -45,14 +47,18 @@ gss_export_name(OM_uint32 *minor_status, gss_name_t input_name,
struct export_name_res res;
struct export_name_args args;
enum clnt_stat stat;
CLIENT *cl;
if (!kgss_gssd_handle)
*minor_status = 0;
cl = kgss_gssd_client();
if (cl == NULL)
return (GSS_S_FAILURE);
args.input_name = input_name->handle;
bzero(&res, sizeof(res));
stat = gssd_export_name_1(&args, &res, kgss_gssd_handle);
stat = gssd_export_name_1(&args, &res, cl);
CLNT_RELEASE(cl);
if (stat != RPC_SUCCESS) {
*minor_status = stat;
return (GSS_S_FAILURE);
@ -63,7 +69,6 @@ gss_export_name(OM_uint32 *minor_status, gss_name_t input_name,
return (res.major_status);
}
*minor_status = 0;
kgss_copy_buffer(&res.exported_name, exported_name);
xdr_free((xdrproc_t) xdr_export_name_res, &res);

37
sys/kgssapi/gss_impl.c
View file

@ -31,8 +31,10 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/priv.h>
#include <sys/syscall.h>
#include <sys/sysent.h>
@ -59,6 +61,7 @@ static bool_t gssd_syscall_registered = FALSE;
struct kgss_mech_list kgss_mechs;
CLIENT *kgss_gssd_handle;
struct mtx kgss_gssd_lock;
static void
kgss_init(void *dummy)
@ -92,14 +95,12 @@ sys_gssd_syscall(struct thread *td, struct gssd_syscall_args *uap)
struct netconfig *nconf;
char path[MAXPATHLEN];
int error;
CLIENT *cl, *oldcl;
error = priv_check(td, PRIV_NFS_DAEMON);
if (error)
return (error);
if (kgss_gssd_handle)
CLNT_DESTROY(kgss_gssd_handle);
error = copyinstr(uap->path, path, sizeof(path), NULL);
if (error)
return (error);
@ -109,10 +110,20 @@ sys_gssd_syscall(struct thread *td, struct gssd_syscall_args *uap)
sun.sun_len = SUN_LEN(&sun);
nconf = getnetconfigent("local");
kgss_gssd_handle = clnt_reconnect_create(nconf,
cl = clnt_reconnect_create(nconf,
(struct sockaddr *) &sun, GSSD, GSSDVERS,
RPC_MAXDATASIZE, RPC_MAXDATASIZE);
mtx_lock(&kgss_gssd_lock);
oldcl = kgss_gssd_handle;
kgss_gssd_handle = cl;
mtx_unlock(&kgss_gssd_lock);
if (oldcl != NULL) {
CLNT_CLOSE(oldcl);
CLNT_RELEASE(oldcl);
}
return (0);
}
@ -248,6 +259,23 @@ kgss_copy_buffer(const gss_buffer_t from, gss_buffer_t to)
}
}
/*
* Acquire the kgss_gssd_handle and return it with a reference count,
* if it is available.
*/
CLIENT *
kgss_gssd_client(void)
{
CLIENT *cl;
mtx_lock(&kgss_gssd_lock);
cl = kgss_gssd_handle;
if (cl != NULL)
CLNT_ACQUIRE(cl);
mtx_unlock(&kgss_gssd_lock);
return (cl);
}
/*
* Kernel module glue
*/
@ -280,6 +308,7 @@ kgssapi_modevent(module_t mod, int type, void *data)
rpc_gss_get_principal_name;
rpc_gss_entries.rpc_gss_svc_max_data_length =
rpc_gss_svc_max_data_length;
mtx_init(&kgss_gssd_lock, "kgss_gssd_lock", NULL, MTX_DEF);
break;
case MOD_UNLOAD:
/*

9
sys/kgssapi/gss_import_name.c
View file

@ -31,7 +31,9 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <kgssapi/gssapi.h>
#include <kgssapi/gssapi_impl.h>
@ -48,18 +50,21 @@ gss_import_name(OM_uint32 *minor_status,
struct import_name_args args;
enum clnt_stat stat;
gss_name_t name;
CLIENT *cl;
*minor_status = 0;
*output_name = GSS_C_NO_NAME;
if (!kgss_gssd_handle)
cl = kgss_gssd_client();
if (cl == NULL)
return (GSS_S_FAILURE);
args.input_name_buffer = *input_name_buffer;
args.input_name_type = input_name_type;
bzero(&res, sizeof(res));
stat = gssd_import_name_1(&args, &res, kgss_gssd_handle);
stat = gssd_import_name_1(&args, &res, cl);
CLNT_RELEASE(cl);
if (stat != RPC_SUCCESS) {
*minor_status = stat;
return (GSS_S_FAILURE);

9
sys/kgssapi/gss_init_sec_context.c
View file

@ -31,7 +31,9 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <kgssapi/gssapi.h>
@ -60,10 +62,12 @@ gss_init_sec_context(OM_uint32 * minor_status,
struct init_sec_context_args args;
enum clnt_stat stat;
gss_ctx_id_t ctx = *context_handle;
CLIENT *cl;
*minor_status = 0;
if (!kgss_gssd_handle)
cl = kgss_gssd_client();
if (cl == NULL)
return (GSS_S_FAILURE);
args.uid = curthread->td_ucred->cr_uid;
@ -88,7 +92,8 @@ gss_init_sec_context(OM_uint32 * minor_status,
}
bzero(&res, sizeof(res));
stat = gssd_init_sec_context_1(&args, &res, kgss_gssd_handle);
stat = gssd_init_sec_context_1(&args, &res, cl);
CLNT_RELEASE(cl);
if (stat != RPC_SUCCESS) {
*minor_status = stat;
return (GSS_S_FAILURE);

24
sys/kgssapi/gss_pname_to_uid.c
View file

@ -31,7 +31,9 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <kgssapi/gssapi.h>
#include <kgssapi/gssapi_impl.h>
@ -45,20 +47,23 @@ gss_pname_to_uid(OM_uint32 *minor_status, const gss_name_t pname,
struct pname_to_uid_res res;
struct pname_to_uid_args args;
enum clnt_stat stat;
CLIENT *cl;
*minor_status = 0;
if (!kgss_gssd_handle)
return (GSS_S_FAILURE);
if (pname == GSS_C_NO_NAME)
return (GSS_S_BAD_NAME);
cl = kgss_gssd_client();
if (cl == NULL)
return (GSS_S_FAILURE);
args.pname = pname->handle;
args.mech = mech;
bzero(&res, sizeof(res));
stat = gssd_pname_to_uid_1(&args, &res, kgss_gssd_handle);
stat = gssd_pname_to_uid_1(&args, &res, cl);
CLNT_RELEASE(cl);
if (stat != RPC_SUCCESS) {
*minor_status = stat;
return (GSS_S_FAILURE);
@ -83,20 +88,23 @@ gss_pname_to_unix_cred(OM_uint32 *minor_status, const gss_name_t pname,
struct pname_to_uid_args args;
enum clnt_stat stat;
int i, n;
CLIENT *cl;
*minor_status = 0;
if (!kgss_gssd_handle)
return (GSS_S_FAILURE);
if (pname == GSS_C_NO_NAME)
return (GSS_S_BAD_NAME);
cl = kgss_gssd_client();
if (cl == NULL)
return (GSS_S_FAILURE);
args.pname = pname->handle;
args.mech = mech;
bzero(&res, sizeof(res));
stat = gssd_pname_to_uid_1(&args, &res, kgss_gssd_handle);
stat = gssd_pname_to_uid_1(&args, &res, cl);
CLNT_RELEASE(cl);
if (stat != RPC_SUCCESS) {
*minor_status = stat;
return (GSS_S_FAILURE);

14
sys/kgssapi/gss_release_cred.c
View file

@ -31,7 +31,9 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <kgssapi/gssapi.h>
#include <kgssapi/gssapi_impl.h>
@ -44,13 +46,21 @@ gss_release_cred(OM_uint32 *minor_status, gss_cred_id_t *cred_handle)
struct release_cred_res res;
struct release_cred_args args;
enum clnt_stat stat;
CLIENT *cl;
*minor_status = 0;
if (!kgss_gssd_handle)
return (GSS_S_FAILURE);
if (*cred_handle) {
args.cred = (*cred_handle)->handle;
stat = gssd_release_cred_1(&args, &res, kgss_gssd_handle);
cl = kgss_gssd_client();
if (cl == NULL)
return (GSS_S_FAILURE);
stat = gssd_release_cred_1(&args, &res, cl);
CLNT_RELEASE(cl);
if (stat != RPC_SUCCESS) {
*minor_status = stat;
return (GSS_S_FAILURE);
@ -63,7 +73,5 @@ gss_release_cred(OM_uint32 *minor_status, gss_cred_id_t *cred_handle)
return (res.major_status);
}
*minor_status = 0;
return (GSS_S_COMPLETE);
}

13
sys/kgssapi/gss_release_name.c
View file

@ -31,7 +31,9 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <kgssapi/gssapi.h>
#include <kgssapi/gssapi_impl.h>
@ -45,6 +47,9 @@ gss_release_name(OM_uint32 *minor_status, gss_name_t *input_name)
struct release_name_args args;
enum clnt_stat stat;
gss_name_t name;
CLIENT *cl;
*minor_status = 0;
if (!kgss_gssd_handle)
return (GSS_S_FAILURE);
@ -53,7 +58,11 @@ gss_release_name(OM_uint32 *minor_status, gss_name_t *input_name)
name = *input_name;
args.input_name = name->handle;
stat = gssd_release_name_1(&args, &res, kgss_gssd_handle);
cl = kgss_gssd_client();
if (cl == NULL)
return (GSS_S_FAILURE);
stat = gssd_release_name_1(&args, &res, cl);
CLNT_RELEASE(cl);
if (stat != RPC_SUCCESS) {
*minor_status = stat;
return (GSS_S_FAILURE);
@ -68,7 +77,5 @@ gss_release_name(OM_uint32 *minor_status, gss_name_t *input_name)
}
}
*minor_status = 0;
return (GSS_S_COMPLETE);
}

9
sys/kgssapi/gss_set_cred_option.c
View file

@ -31,7 +31,9 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kobj.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <kgssapi/gssapi.h>
#include <kgssapi/gssapi_impl.h>
@ -47,10 +49,12 @@ gss_set_cred_option(OM_uint32 *minor_status,
struct set_cred_option_res res;
struct set_cred_option_args args;
enum clnt_stat stat;
CLIENT *cl;
*minor_status = 0;
if (!kgss_gssd_handle)
cl = kgss_gssd_client();
if (cl == NULL)
return (GSS_S_FAILURE);
if (cred)
@ -61,7 +65,8 @@ gss_set_cred_option(OM_uint32 *minor_status,
args.option_value = *option_value;
bzero(&res, sizeof(res));
stat = gssd_set_cred_option_1(&args, &res, kgss_gssd_handle);
stat = gssd_set_cred_option_1(&args, &res, cl);
CLNT_RELEASE(cl);
if (stat != RPC_SUCCESS) {
*minor_status = stat;

2
sys/kgssapi/gssapi_impl.h
View file

@ -53,8 +53,10 @@ struct kgss_mech {
LIST_HEAD(kgss_mech_list, kgss_mech);
extern CLIENT *kgss_gssd_handle;
extern struct mtx kgss_gssd_lock;
extern struct kgss_mech_list kgss_mechs;
CLIENT *kgss_gssd_client(void);
int kgss_oid_equal(const gss_OID oid1, const gss_OID oid2);
extern void kgss_install_mech(gss_OID mech_type, const char *name,
struct kobj_class *cls);