| /* |
| * linux/net/sunrpc/auth_gss/auth_gss.c |
| * |
| * RPCSEC_GSS client authentication. |
| * |
| * Copyright (c) 2000 The Regents of the University of Michigan. |
| * All rights reserved. |
| * |
| * Dug Song <dugsong@monkey.org> |
| * Andy Adamson <andros@umich.edu> |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the University nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/types.h> |
| #include <linux/slab.h> |
| #include <linux/sched.h> |
| #include <linux/pagemap.h> |
| #include <linux/sunrpc/clnt.h> |
| #include <linux/sunrpc/auth.h> |
| #include <linux/sunrpc/auth_gss.h> |
| #include <linux/sunrpc/svcauth_gss.h> |
| #include <linux/sunrpc/gss_err.h> |
| #include <linux/workqueue.h> |
| #include <linux/sunrpc/rpc_pipe_fs.h> |
| #include <linux/sunrpc/gss_api.h> |
| #include <linux/uaccess.h> |
| #include <linux/hashtable.h> |
| |
| #include "../netns.h" |
| |
| static const struct rpc_authops authgss_ops; |
| |
| static const struct rpc_credops gss_credops; |
| static const struct rpc_credops gss_nullops; |
| |
| #define GSS_RETRY_EXPIRED 5 |
| static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED; |
| |
| #define GSS_KEY_EXPIRE_TIMEO 240 |
| static unsigned int gss_key_expire_timeo = GSS_KEY_EXPIRE_TIMEO; |
| |
| #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
| # define RPCDBG_FACILITY RPCDBG_AUTH |
| #endif |
| |
| #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2) |
| /* length of a krb5 verifier (48), plus data added before arguments when |
| * using integrity (two 4-byte integers): */ |
| #define GSS_VERF_SLACK 100 |
| |
| static DEFINE_HASHTABLE(gss_auth_hash_table, 4); |
| static DEFINE_SPINLOCK(gss_auth_hash_lock); |
| |
| struct gss_pipe { |
| struct rpc_pipe_dir_object pdo; |
| struct rpc_pipe *pipe; |
| struct rpc_clnt *clnt; |
| const char *name; |
| struct kref kref; |
| }; |
| |
| struct gss_auth { |
| struct kref kref; |
| struct hlist_node hash; |
| struct rpc_auth rpc_auth; |
| struct gss_api_mech *mech; |
| enum rpc_gss_svc service; |
| struct rpc_clnt *client; |
| struct net *net; |
| /* |
| * There are two upcall pipes; dentry[1], named "gssd", is used |
| * for the new text-based upcall; dentry[0] is named after the |
| * mechanism (for example, "krb5") and exists for |
| * backwards-compatibility with older gssd's. |
| */ |
| struct gss_pipe *gss_pipe[2]; |
| const char *target_name; |
| }; |
| |
| /* pipe_version >= 0 if and only if someone has a pipe open. */ |
| static DEFINE_SPINLOCK(pipe_version_lock); |
| static struct rpc_wait_queue pipe_version_rpc_waitqueue; |
| static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); |
| static void gss_put_auth(struct gss_auth *gss_auth); |
| |
| static void gss_free_ctx(struct gss_cl_ctx *); |
| static const struct rpc_pipe_ops gss_upcall_ops_v0; |
| static const struct rpc_pipe_ops gss_upcall_ops_v1; |
| |
| static inline struct gss_cl_ctx * |
| gss_get_ctx(struct gss_cl_ctx *ctx) |
| { |
| refcount_inc(&ctx->count); |
| return ctx; |
| } |
| |
| static inline void |
| gss_put_ctx(struct gss_cl_ctx *ctx) |
| { |
| if (refcount_dec_and_test(&ctx->count)) |
| gss_free_ctx(ctx); |
| } |
| |
| /* gss_cred_set_ctx: |
| * called by gss_upcall_callback and gss_create_upcall in order |
| * to set the gss context. The actual exchange of an old context |
| * and a new one is protected by the pipe->lock. |
| */ |
| static void |
| gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) |
| { |
| struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
| |
| if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
| return; |
| gss_get_ctx(ctx); |
| rcu_assign_pointer(gss_cred->gc_ctx, ctx); |
| set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
| smp_mb__before_atomic(); |
| clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); |
| } |
| |
| static const void * |
| simple_get_bytes(const void *p, const void *end, void *res, size_t len) |
| { |
| const void *q = (const void *)((const char *)p + len); |
| if (unlikely(q > end || q < p)) |
| return ERR_PTR(-EFAULT); |
| memcpy(res, p, len); |
| return q; |
| } |
| |
| static inline const void * |
| simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) |
| { |
| const void *q; |
| unsigned int len; |
| |
| p = simple_get_bytes(p, end, &len, sizeof(len)); |
| if (IS_ERR(p)) |
| return p; |
| q = (const void *)((const char *)p + len); |
| if (unlikely(q > end || q < p)) |
| return ERR_PTR(-EFAULT); |
| dest->data = kmemdup(p, len, GFP_NOFS); |
| if (unlikely(dest->data == NULL)) |
| return ERR_PTR(-ENOMEM); |
| dest->len = len; |
| return q; |
| } |
| |
| static struct gss_cl_ctx * |
| gss_cred_get_ctx(struct rpc_cred *cred) |
| { |
| struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
| struct gss_cl_ctx *ctx = NULL; |
| |
| rcu_read_lock(); |
| ctx = rcu_dereference(gss_cred->gc_ctx); |
| if (ctx) |
| gss_get_ctx(ctx); |
| rcu_read_unlock(); |
| return ctx; |
| } |
| |
| static struct gss_cl_ctx * |
| gss_alloc_context(void) |
| { |
| struct gss_cl_ctx *ctx; |
| |
| ctx = kzalloc(sizeof(*ctx), GFP_NOFS); |
| if (ctx != NULL) { |
| ctx->gc_proc = RPC_GSS_PROC_DATA; |
| ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ |
| spin_lock_init(&ctx->gc_seq_lock); |
| refcount_set(&ctx->count,1); |
| } |
| return ctx; |
| } |
| |
| #define GSSD_MIN_TIMEOUT (60 * 60) |
| static const void * |
| gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) |
| { |
| const void *q; |
| unsigned int seclen; |
| unsigned int timeout; |
| unsigned long now = jiffies; |
| u32 window_size; |
| int ret; |
| |
| /* First unsigned int gives the remaining lifetime in seconds of the |
| * credential - e.g. the remaining TGT lifetime for Kerberos or |
| * the -t value passed to GSSD. |
| */ |
| p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); |
| if (IS_ERR(p)) |
| goto err; |
| if (timeout == 0) |
| timeout = GSSD_MIN_TIMEOUT; |
| ctx->gc_expiry = now + ((unsigned long)timeout * HZ); |
| /* Sequence number window. Determines the maximum number of |
| * simultaneous requests |
| */ |
| p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); |
| if (IS_ERR(p)) |
| goto err; |
| ctx->gc_win = window_size; |
| /* gssd signals an error by passing ctx->gc_win = 0: */ |
| if (ctx->gc_win == 0) { |
| /* |
| * in which case, p points to an error code. Anything other |
| * than -EKEYEXPIRED gets converted to -EACCES. |
| */ |
| p = simple_get_bytes(p, end, &ret, sizeof(ret)); |
| if (!IS_ERR(p)) |
| p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : |
| ERR_PTR(-EACCES); |
| goto err; |
| } |
| /* copy the opaque wire context */ |
| p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); |
| if (IS_ERR(p)) |
| goto err; |
| /* import the opaque security context */ |
| p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); |
| if (IS_ERR(p)) |
| goto err; |
| q = (const void *)((const char *)p + seclen); |
| if (unlikely(q > end || q < p)) { |
| p = ERR_PTR(-EFAULT); |
| goto err; |
| } |
| ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS); |
| if (ret < 0) { |
| p = ERR_PTR(ret); |
| goto err; |
| } |
| |
| /* is there any trailing data? */ |
| if (q == end) { |
| p = q; |
| goto done; |
| } |
| |
| /* pull in acceptor name (if there is one) */ |
| p = simple_get_netobj(q, end, &ctx->gc_acceptor); |
| if (IS_ERR(p)) |
| goto err; |
| done: |
| dprintk("RPC: %s Success. gc_expiry %lu now %lu timeout %u acceptor %.*s\n", |
| __func__, ctx->gc_expiry, now, timeout, ctx->gc_acceptor.len, |
| ctx->gc_acceptor.data); |
| return p; |
| err: |
| dprintk("RPC: %s returns error %ld\n", __func__, -PTR_ERR(p)); |
| return p; |
| } |
| |
| #define UPCALL_BUF_LEN 128 |
| |
| struct gss_upcall_msg { |
| refcount_t count; |
| kuid_t uid; |
| struct rpc_pipe_msg msg; |
| struct list_head list; |
| struct gss_auth *auth; |
| struct rpc_pipe *pipe; |
| struct rpc_wait_queue rpc_waitqueue; |
| wait_queue_head_t waitqueue; |
| struct gss_cl_ctx *ctx; |
| char databuf[UPCALL_BUF_LEN]; |
| }; |
| |
| static int get_pipe_version(struct net *net) |
| { |
| struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| int ret; |
| |
| spin_lock(&pipe_version_lock); |
| if (sn->pipe_version >= 0) { |
| atomic_inc(&sn->pipe_users); |
| ret = sn->pipe_version; |
| } else |
| ret = -EAGAIN; |
| spin_unlock(&pipe_version_lock); |
| return ret; |
| } |
| |
| static void put_pipe_version(struct net *net) |
| { |
| struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| |
| if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) { |
| sn->pipe_version = -1; |
| spin_unlock(&pipe_version_lock); |
| } |
| } |
| |
| static void |
| gss_release_msg(struct gss_upcall_msg *gss_msg) |
| { |
| struct net *net = gss_msg->auth->net; |
| if (!refcount_dec_and_test(&gss_msg->count)) |
| return; |
| put_pipe_version(net); |
| BUG_ON(!list_empty(&gss_msg->list)); |
| if (gss_msg->ctx != NULL) |
| gss_put_ctx(gss_msg->ctx); |
| rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); |
| gss_put_auth(gss_msg->auth); |
| kfree(gss_msg); |
| } |
| |
| static struct gss_upcall_msg * |
| __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid, const struct gss_auth *auth) |
| { |
| struct gss_upcall_msg *pos; |
| list_for_each_entry(pos, &pipe->in_downcall, list) { |
| if (!uid_eq(pos->uid, uid)) |
| continue; |
| if (auth && pos->auth->service != auth->service) |
| continue; |
| refcount_inc(&pos->count); |
| dprintk("RPC: %s found msg %p\n", __func__, pos); |
| return pos; |
| } |
| dprintk("RPC: %s found nothing\n", __func__); |
| return NULL; |
| } |
| |
| /* Try to add an upcall to the pipefs queue. |
| * If an upcall owned by our uid already exists, then we return a reference |
| * to that upcall instead of adding the new upcall. |
| */ |
| static inline struct gss_upcall_msg * |
| gss_add_msg(struct gss_upcall_msg *gss_msg) |
| { |
| struct rpc_pipe *pipe = gss_msg->pipe; |
| struct gss_upcall_msg *old; |
| |
| spin_lock(&pipe->lock); |
| old = __gss_find_upcall(pipe, gss_msg->uid, gss_msg->auth); |
| if (old == NULL) { |
| refcount_inc(&gss_msg->count); |
| list_add(&gss_msg->list, &pipe->in_downcall); |
| } else |
| gss_msg = old; |
| spin_unlock(&pipe->lock); |
| return gss_msg; |
| } |
| |
| static void |
| __gss_unhash_msg(struct gss_upcall_msg *gss_msg) |
| { |
| list_del_init(&gss_msg->list); |
| rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); |
| wake_up_all(&gss_msg->waitqueue); |
| refcount_dec(&gss_msg->count); |
| } |
| |
| static void |
| gss_unhash_msg(struct gss_upcall_msg *gss_msg) |
| { |
| struct rpc_pipe *pipe = gss_msg->pipe; |
| |
| if (list_empty(&gss_msg->list)) |
| return; |
| spin_lock(&pipe->lock); |
| if (!list_empty(&gss_msg->list)) |
| __gss_unhash_msg(gss_msg); |
| spin_unlock(&pipe->lock); |
| } |
| |
| static void |
| gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) |
| { |
| switch (gss_msg->msg.errno) { |
| case 0: |
| if (gss_msg->ctx == NULL) |
| break; |
| clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); |
| gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); |
| break; |
| case -EKEYEXPIRED: |
| set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); |
| } |
| gss_cred->gc_upcall_timestamp = jiffies; |
| gss_cred->gc_upcall = NULL; |
| rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); |
| } |
| |
| static void |
| gss_upcall_callback(struct rpc_task *task) |
| { |
| struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, |
| struct gss_cred, gc_base); |
| struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; |
| struct rpc_pipe *pipe = gss_msg->pipe; |
| |
| spin_lock(&pipe->lock); |
| gss_handle_downcall_result(gss_cred, gss_msg); |
| spin_unlock(&pipe->lock); |
| task->tk_status = gss_msg->msg.errno; |
| gss_release_msg(gss_msg); |
| } |
| |
| static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) |
| { |
| uid_t uid = from_kuid(&init_user_ns, gss_msg->uid); |
| memcpy(gss_msg->databuf, &uid, sizeof(uid)); |
| gss_msg->msg.data = gss_msg->databuf; |
| gss_msg->msg.len = sizeof(uid); |
| |
| BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf)); |
| } |
| |
| static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, |
| const char *service_name, |
| const char *target_name) |
| { |
| struct gss_api_mech *mech = gss_msg->auth->mech; |
| char *p = gss_msg->databuf; |
| size_t buflen = sizeof(gss_msg->databuf); |
| int len; |
| |
| len = scnprintf(p, buflen, "mech=%s uid=%d ", mech->gm_name, |
| from_kuid(&init_user_ns, gss_msg->uid)); |
| buflen -= len; |
| p += len; |
| gss_msg->msg.len = len; |
| if (target_name) { |
| len = scnprintf(p, buflen, "target=%s ", target_name); |
| buflen -= len; |
| p += len; |
| gss_msg->msg.len += len; |
| } |
| if (service_name != NULL) { |
| len = scnprintf(p, buflen, "service=%s ", service_name); |
| buflen -= len; |
| p += len; |
| gss_msg->msg.len += len; |
| } |
| if (mech->gm_upcall_enctypes) { |
| len = scnprintf(p, buflen, "enctypes=%s ", |
| mech->gm_upcall_enctypes); |
| buflen -= len; |
| p += len; |
| gss_msg->msg.len += len; |
| } |
| len = scnprintf(p, buflen, "\n"); |
| if (len == 0) |
| goto out_overflow; |
| gss_msg->msg.len += len; |
| |
| gss_msg->msg.data = gss_msg->databuf; |
| return 0; |
| out_overflow: |
| WARN_ON_ONCE(1); |
| return -ENOMEM; |
| } |
| |
| static struct gss_upcall_msg * |
| gss_alloc_msg(struct gss_auth *gss_auth, |
| kuid_t uid, const char *service_name) |
| { |
| struct gss_upcall_msg *gss_msg; |
| int vers; |
| int err = -ENOMEM; |
| |
| gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); |
| if (gss_msg == NULL) |
| goto err; |
| vers = get_pipe_version(gss_auth->net); |
| err = vers; |
| if (err < 0) |
| goto err_free_msg; |
| gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe; |
| INIT_LIST_HEAD(&gss_msg->list); |
| rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); |
| init_waitqueue_head(&gss_msg->waitqueue); |
| refcount_set(&gss_msg->count, 1); |
| gss_msg->uid = uid; |
| gss_msg->auth = gss_auth; |
| switch (vers) { |
| case 0: |
| gss_encode_v0_msg(gss_msg); |
| break; |
| default: |
| err = gss_encode_v1_msg(gss_msg, service_name, gss_auth->target_name); |
| if (err) |
| goto err_put_pipe_version; |
| } |
| kref_get(&gss_auth->kref); |
| return gss_msg; |
| err_put_pipe_version: |
| put_pipe_version(gss_auth->net); |
| err_free_msg: |
| kfree(gss_msg); |
| err: |
| return ERR_PTR(err); |
| } |
| |
| static struct gss_upcall_msg * |
| gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred) |
| { |
| struct gss_cred *gss_cred = container_of(cred, |
| struct gss_cred, gc_base); |
| struct gss_upcall_msg *gss_new, *gss_msg; |
| kuid_t uid = cred->cr_uid; |
| |
| gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal); |
| if (IS_ERR(gss_new)) |
| return gss_new; |
| gss_msg = gss_add_msg(gss_new); |
| if (gss_msg == gss_new) { |
| int res; |
| refcount_inc(&gss_msg->count); |
| res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); |
| if (res) { |
| gss_unhash_msg(gss_new); |
| refcount_dec(&gss_msg->count); |
| gss_release_msg(gss_new); |
| gss_msg = ERR_PTR(res); |
| } |
| } else |
| gss_release_msg(gss_new); |
| return gss_msg; |
| } |
| |
| static void warn_gssd(void) |
| { |
| dprintk("AUTH_GSS upcall failed. Please check user daemon is running.\n"); |
| } |
| |
| static inline int |
| gss_refresh_upcall(struct rpc_task *task) |
| { |
| struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
| struct gss_auth *gss_auth = container_of(cred->cr_auth, |
| struct gss_auth, rpc_auth); |
| struct gss_cred *gss_cred = container_of(cred, |
| struct gss_cred, gc_base); |
| struct gss_upcall_msg *gss_msg; |
| struct rpc_pipe *pipe; |
| int err = 0; |
| |
| dprintk("RPC: %5u %s for uid %u\n", |
| task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid)); |
| gss_msg = gss_setup_upcall(gss_auth, cred); |
| if (PTR_ERR(gss_msg) == -EAGAIN) { |
| /* XXX: warning on the first, under the assumption we |
| * shouldn't normally hit this case on a refresh. */ |
| warn_gssd(); |
| task->tk_timeout = 15*HZ; |
| rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); |
| return -EAGAIN; |
| } |
| if (IS_ERR(gss_msg)) { |
| err = PTR_ERR(gss_msg); |
| goto out; |
| } |
| pipe = gss_msg->pipe; |
| spin_lock(&pipe->lock); |
| if (gss_cred->gc_upcall != NULL) |
| rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); |
| else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { |
| task->tk_timeout = 0; |
| gss_cred->gc_upcall = gss_msg; |
| /* gss_upcall_callback will release the reference to gss_upcall_msg */ |
| refcount_inc(&gss_msg->count); |
| rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); |
| } else { |
| gss_handle_downcall_result(gss_cred, gss_msg); |
| err = gss_msg->msg.errno; |
| } |
| spin_unlock(&pipe->lock); |
| gss_release_msg(gss_msg); |
| out: |
| dprintk("RPC: %5u %s for uid %u result %d\n", |
| task->tk_pid, __func__, |
| from_kuid(&init_user_ns, cred->cr_uid), err); |
| return err; |
| } |
| |
| static inline int |
| gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) |
| { |
| struct net *net = gss_auth->net; |
| struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| struct rpc_pipe *pipe; |
| struct rpc_cred *cred = &gss_cred->gc_base; |
| struct gss_upcall_msg *gss_msg; |
| DEFINE_WAIT(wait); |
| int err; |
| |
| dprintk("RPC: %s for uid %u\n", |
| __func__, from_kuid(&init_user_ns, cred->cr_uid)); |
| retry: |
| err = 0; |
| /* if gssd is down, just skip upcalling altogether */ |
| if (!gssd_running(net)) { |
| warn_gssd(); |
| return -EACCES; |
| } |
| gss_msg = gss_setup_upcall(gss_auth, cred); |
| if (PTR_ERR(gss_msg) == -EAGAIN) { |
| err = wait_event_interruptible_timeout(pipe_version_waitqueue, |
| sn->pipe_version >= 0, 15 * HZ); |
| if (sn->pipe_version < 0) { |
| warn_gssd(); |
| err = -EACCES; |
| } |
| if (err < 0) |
| goto out; |
| goto retry; |
| } |
| if (IS_ERR(gss_msg)) { |
| err = PTR_ERR(gss_msg); |
| goto out; |
| } |
| pipe = gss_msg->pipe; |
| for (;;) { |
| prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); |
| spin_lock(&pipe->lock); |
| if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
| break; |
| } |
| spin_unlock(&pipe->lock); |
| if (fatal_signal_pending(current)) { |
| err = -ERESTARTSYS; |
| goto out_intr; |
| } |
| schedule(); |
| } |
| if (gss_msg->ctx) |
| gss_cred_set_ctx(cred, gss_msg->ctx); |
| else |
| err = gss_msg->msg.errno; |
| spin_unlock(&pipe->lock); |
| out_intr: |
| finish_wait(&gss_msg->waitqueue, &wait); |
| gss_release_msg(gss_msg); |
| out: |
| dprintk("RPC: %s for uid %u result %d\n", |
| __func__, from_kuid(&init_user_ns, cred->cr_uid), err); |
| return err; |
| } |
| |
| #define MSG_BUF_MAXSIZE 1024 |
| |
| static ssize_t |
| gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) |
| { |
| const void *p, *end; |
| void *buf; |
| struct gss_upcall_msg *gss_msg; |
| struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe; |
| struct gss_cl_ctx *ctx; |
| uid_t id; |
| kuid_t uid; |
| ssize_t err = -EFBIG; |
| |
| if (mlen > MSG_BUF_MAXSIZE) |
| goto out; |
| err = -ENOMEM; |
| buf = kmalloc(mlen, GFP_NOFS); |
| if (!buf) |
| goto out; |
| |
| err = -EFAULT; |
| if (copy_from_user(buf, src, mlen)) |
| goto err; |
| |
| end = (const void *)((char *)buf + mlen); |
| p = simple_get_bytes(buf, end, &id, sizeof(id)); |
| if (IS_ERR(p)) { |
| err = PTR_ERR(p); |
| goto err; |
| } |
| |
| uid = make_kuid(&init_user_ns, id); |
| if (!uid_valid(uid)) { |
| err = -EINVAL; |
| goto err; |
| } |
| |
| err = -ENOMEM; |
| ctx = gss_alloc_context(); |
| if (ctx == NULL) |
| goto err; |
| |
| err = -ENOENT; |
| /* Find a matching upcall */ |
| spin_lock(&pipe->lock); |
| gss_msg = __gss_find_upcall(pipe, uid, NULL); |
| if (gss_msg == NULL) { |
| spin_unlock(&pipe->lock); |
| goto err_put_ctx; |
| } |
| list_del_init(&gss_msg->list); |
| spin_unlock(&pipe->lock); |
| |
| p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); |
| if (IS_ERR(p)) { |
| err = PTR_ERR(p); |
| switch (err) { |
| case -EACCES: |
| case -EKEYEXPIRED: |
| gss_msg->msg.errno = err; |
| err = mlen; |
| break; |
| case -EFAULT: |
| case -ENOMEM: |
| case -EINVAL: |
| case -ENOSYS: |
| gss_msg->msg.errno = -EAGAIN; |
| break; |
| default: |
| printk(KERN_CRIT "%s: bad return from " |
| "gss_fill_context: %zd\n", __func__, err); |
| gss_msg->msg.errno = -EIO; |
| } |
| goto err_release_msg; |
| } |
| gss_msg->ctx = gss_get_ctx(ctx); |
| err = mlen; |
| |
| err_release_msg: |
| spin_lock(&pipe->lock); |
| __gss_unhash_msg(gss_msg); |
| spin_unlock(&pipe->lock); |
| gss_release_msg(gss_msg); |
| err_put_ctx: |
| gss_put_ctx(ctx); |
| err: |
| kfree(buf); |
| out: |
| dprintk("RPC: %s returning %zd\n", __func__, err); |
| return err; |
| } |
| |
| static int gss_pipe_open(struct inode *inode, int new_version) |
| { |
| struct net *net = inode->i_sb->s_fs_info; |
| struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| int ret = 0; |
| |
| spin_lock(&pipe_version_lock); |
| if (sn->pipe_version < 0) { |
| /* First open of any gss pipe determines the version: */ |
| sn->pipe_version = new_version; |
| rpc_wake_up(&pipe_version_rpc_waitqueue); |
| wake_up(&pipe_version_waitqueue); |
| } else if (sn->pipe_version != new_version) { |
| /* Trying to open a pipe of a different version */ |
| ret = -EBUSY; |
| goto out; |
| } |
| atomic_inc(&sn->pipe_users); |
| out: |
| spin_unlock(&pipe_version_lock); |
| return ret; |
| |
| } |
| |
| static int gss_pipe_open_v0(struct inode *inode) |
| { |
| return gss_pipe_open(inode, 0); |
| } |
| |
| static int gss_pipe_open_v1(struct inode *inode) |
| { |
| return gss_pipe_open(inode, 1); |
| } |
| |
| static void |
| gss_pipe_release(struct inode *inode) |
| { |
| struct net *net = inode->i_sb->s_fs_info; |
| struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
| struct gss_upcall_msg *gss_msg; |
| |
| restart: |
| spin_lock(&pipe->lock); |
| list_for_each_entry(gss_msg, &pipe->in_downcall, list) { |
| |
| if (!list_empty(&gss_msg->msg.list)) |
| continue; |
| gss_msg->msg.errno = -EPIPE; |
| refcount_inc(&gss_msg->count); |
| __gss_unhash_msg(gss_msg); |
| spin_unlock(&pipe->lock); |
| gss_release_msg(gss_msg); |
| goto restart; |
| } |
| spin_unlock(&pipe->lock); |
| |
| put_pipe_version(net); |
| } |
| |
| static void |
| gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) |
| { |
| struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); |
| |
| if (msg->errno < 0) { |
| dprintk("RPC: %s releasing msg %p\n", |
| __func__, gss_msg); |
| refcount_inc(&gss_msg->count); |
| gss_unhash_msg(gss_msg); |
| if (msg->errno == -ETIMEDOUT) |
| warn_gssd(); |
| gss_release_msg(gss_msg); |
| } |
| gss_release_msg(gss_msg); |
| } |
| |
| static void gss_pipe_dentry_destroy(struct dentry *dir, |
| struct rpc_pipe_dir_object *pdo) |
| { |
| struct gss_pipe *gss_pipe = pdo->pdo_data; |
| struct rpc_pipe *pipe = gss_pipe->pipe; |
| |
| if (pipe->dentry != NULL) { |
| rpc_unlink(pipe->dentry); |
| pipe->dentry = NULL; |
| } |
| } |
| |
| static int gss_pipe_dentry_create(struct dentry *dir, |
| struct rpc_pipe_dir_object *pdo) |
| { |
| struct gss_pipe *p = pdo->pdo_data; |
| struct dentry *dentry; |
| |
| dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe); |
| if (IS_ERR(dentry)) |
| return PTR_ERR(dentry); |
| p->pipe->dentry = dentry; |
| return 0; |
| } |
| |
| static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = { |
| .create = gss_pipe_dentry_create, |
| .destroy = gss_pipe_dentry_destroy, |
| }; |
| |
| static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt, |
| const char *name, |
| const struct rpc_pipe_ops *upcall_ops) |
| { |
| struct gss_pipe *p; |
| int err = -ENOMEM; |
| |
| p = kmalloc(sizeof(*p), GFP_KERNEL); |
| if (p == NULL) |
| goto err; |
| p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); |
| if (IS_ERR(p->pipe)) { |
| err = PTR_ERR(p->pipe); |
| goto err_free_gss_pipe; |
| } |
| p->name = name; |
| p->clnt = clnt; |
| kref_init(&p->kref); |
| rpc_init_pipe_dir_object(&p->pdo, |
| &gss_pipe_dir_object_ops, |
| p); |
| return p; |
| err_free_gss_pipe: |
| kfree(p); |
| err: |
| return ERR_PTR(err); |
| } |
| |
| struct gss_alloc_pdo { |
| struct rpc_clnt *clnt; |
| const char *name; |
| const struct rpc_pipe_ops *upcall_ops; |
| }; |
| |
| static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data) |
| { |
| struct gss_pipe *gss_pipe; |
| struct gss_alloc_pdo *args = data; |
| |
| if (pdo->pdo_ops != &gss_pipe_dir_object_ops) |
| return 0; |
| gss_pipe = container_of(pdo, struct gss_pipe, pdo); |
| if (strcmp(gss_pipe->name, args->name) != 0) |
| return 0; |
| if (!kref_get_unless_zero(&gss_pipe->kref)) |
| return 0; |
| return 1; |
| } |
| |
| static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data) |
| { |
| struct gss_pipe *gss_pipe; |
| struct gss_alloc_pdo *args = data; |
| |
| gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops); |
| if (!IS_ERR(gss_pipe)) |
| return &gss_pipe->pdo; |
| return NULL; |
| } |
| |
| static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt, |
| const char *name, |
| const struct rpc_pipe_ops *upcall_ops) |
| { |
| struct net *net = rpc_net_ns(clnt); |
| struct rpc_pipe_dir_object *pdo; |
| struct gss_alloc_pdo args = { |
| .clnt = clnt, |
| .name = name, |
| .upcall_ops = upcall_ops, |
| }; |
| |
| pdo = rpc_find_or_alloc_pipe_dir_object(net, |
| &clnt->cl_pipedir_objects, |
| gss_pipe_match_pdo, |
| gss_pipe_alloc_pdo, |
| &args); |
| if (pdo != NULL) |
| return container_of(pdo, struct gss_pipe, pdo); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| static void __gss_pipe_free(struct gss_pipe *p) |
| { |
| struct rpc_clnt *clnt = p->clnt; |
| struct net *net = rpc_net_ns(clnt); |
| |
| rpc_remove_pipe_dir_object(net, |
| &clnt->cl_pipedir_objects, |
| &p->pdo); |
| rpc_destroy_pipe_data(p->pipe); |
| kfree(p); |
| } |
| |
| static void __gss_pipe_release(struct kref *kref) |
| { |
| struct gss_pipe *p = container_of(kref, struct gss_pipe, kref); |
| |
| __gss_pipe_free(p); |
| } |
| |
| static void gss_pipe_free(struct gss_pipe *p) |
| { |
| if (p != NULL) |
| kref_put(&p->kref, __gss_pipe_release); |
| } |
| |
| /* |
| * NOTE: we have the opportunity to use different |
| * parameters based on the input flavor (which must be a pseudoflavor) |
| */ |
| static struct gss_auth * |
| gss_create_new(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) |
| { |
| rpc_authflavor_t flavor = args->pseudoflavor; |
| struct gss_auth *gss_auth; |
| struct gss_pipe *gss_pipe; |
| struct rpc_auth * auth; |
| int err = -ENOMEM; /* XXX? */ |
| |
| dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
| |
| if (!try_module_get(THIS_MODULE)) |
| return ERR_PTR(err); |
| if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
| goto out_dec; |
| INIT_HLIST_NODE(&gss_auth->hash); |
| gss_auth->target_name = NULL; |
| if (args->target_name) { |
| gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL); |
| if (gss_auth->target_name == NULL) |
| goto err_free; |
| } |
| gss_auth->client = clnt; |
| gss_auth->net = get_net(rpc_net_ns(clnt)); |
| err = -EINVAL; |
| gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
| if (!gss_auth->mech) { |
| dprintk("RPC: Pseudoflavor %d not found!\n", flavor); |
| goto err_put_net; |
| } |
| gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); |
| if (gss_auth->service == 0) |
| goto err_put_mech; |
| if (!gssd_running(gss_auth->net)) |
| goto err_put_mech; |
| auth = &gss_auth->rpc_auth; |
| auth->au_cslack = GSS_CRED_SLACK >> 2; |
| auth->au_rslack = GSS_VERF_SLACK >> 2; |
| auth->au_flags = 0; |
| auth->au_ops = &authgss_ops; |
| auth->au_flavor = flavor; |
| if (gss_pseudoflavor_to_datatouch(gss_auth->mech, flavor)) |
| auth->au_flags |= RPCAUTH_AUTH_DATATOUCH; |
| atomic_set(&auth->au_count, 1); |
| kref_init(&gss_auth->kref); |
| |
| err = rpcauth_init_credcache(auth); |
| if (err) |
| goto err_put_mech; |
| /* |
| * Note: if we created the old pipe first, then someone who |
| * examined the directory at the right moment might conclude |
| * that we supported only the old pipe. So we instead create |
| * the new pipe first. |
| */ |
| gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1); |
| if (IS_ERR(gss_pipe)) { |
| err = PTR_ERR(gss_pipe); |
| goto err_destroy_credcache; |
| } |
| gss_auth->gss_pipe[1] = gss_pipe; |
| |
| gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name, |
| &gss_upcall_ops_v0); |
| if (IS_ERR(gss_pipe)) { |
| err = PTR_ERR(gss_pipe); |
| goto err_destroy_pipe_1; |
| } |
| gss_auth->gss_pipe[0] = gss_pipe; |
| |
| return gss_auth; |
| err_destroy_pipe_1: |
| gss_pipe_free(gss_auth->gss_pipe[1]); |
| err_destroy_credcache: |
| rpcauth_destroy_credcache(auth); |
| err_put_mech: |
| gss_mech_put(gss_auth->mech); |
| err_put_net: |
| put_net(gss_auth->net); |
| err_free: |
| kfree(gss_auth->target_name); |
| kfree(gss_auth); |
| out_dec: |
| module_put(THIS_MODULE); |
| return ERR_PTR(err); |
| } |
| |
| static void |
| gss_free(struct gss_auth *gss_auth) |
| { |
| gss_pipe_free(gss_auth->gss_pipe[0]); |
| gss_pipe_free(gss_auth->gss_pipe[1]); |
| gss_mech_put(gss_auth->mech); |
| put_net(gss_auth->net); |
| kfree(gss_auth->target_name); |
| |
| kfree(gss_auth); |
| module_put(THIS_MODULE); |
| } |
| |
| static void |
| gss_free_callback(struct kref *kref) |
| { |
| struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); |
| |
| gss_free(gss_auth); |
| } |
| |
| static void |
| gss_put_auth(struct gss_auth *gss_auth) |
| { |
| kref_put(&gss_auth->kref, gss_free_callback); |
| } |
| |
| static void |
| gss_destroy(struct rpc_auth *auth) |
| { |
| struct gss_auth *gss_auth = container_of(auth, |
| struct gss_auth, rpc_auth); |
| |
| dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
| auth, auth->au_flavor); |
| |
| if (hash_hashed(&gss_auth->hash)) { |
| spin_lock(&gss_auth_hash_lock); |
| hash_del(&gss_auth->hash); |
| spin_unlock(&gss_auth_hash_lock); |
| } |
| |
| gss_pipe_free(gss_auth->gss_pipe[0]); |
| gss_auth->gss_pipe[0] = NULL; |
| gss_pipe_free(gss_auth->gss_pipe[1]); |
| gss_auth->gss_pipe[1] = NULL; |
| rpcauth_destroy_credcache(auth); |
| |
| gss_put_auth(gss_auth); |
| } |
| |
| /* |
| * Auths may be shared between rpc clients that were cloned from a |
| * common client with the same xprt, if they also share the flavor and |
| * target_name. |
| * |
| * The auth is looked up from the oldest parent sharing the same |
| * cl_xprt, and the auth itself references only that common parent |
| * (which is guaranteed to last as long as any of its descendants). |
| */ |
| static struct gss_auth * |
| gss_auth_find_or_add_hashed(struct rpc_auth_create_args *args, |
| struct rpc_clnt *clnt, |
| struct gss_auth *new) |
| { |
| struct gss_auth *gss_auth; |
| unsigned long hashval = (unsigned long)clnt; |
| |
| spin_lock(&gss_auth_hash_lock); |
| hash_for_each_possible(gss_auth_hash_table, |
| gss_auth, |
| hash, |
| hashval) { |
| if (gss_auth->client != clnt) |
| continue; |
| if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor) |
| continue; |
| if (gss_auth->target_name != args->target_name) { |
| if (gss_auth->target_name == NULL) |
| continue; |
| if (args->target_name == NULL) |
| continue; |
| if (strcmp(gss_auth->target_name, args->target_name)) |
| continue; |
| } |
| if (!atomic_inc_not_zero(&gss_auth->rpc_auth.au_count)) |
| continue; |
| goto out; |
| } |
| if (new) |
| hash_add(gss_auth_hash_table, &new->hash, hashval); |
| gss_auth = new; |
| out: |
| spin_unlock(&gss_auth_hash_lock); |
| return gss_auth; |
| } |
| |
| static struct gss_auth * |
| gss_create_hashed(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) |
| { |
| struct gss_auth *gss_auth; |
| struct gss_auth *new; |
| |
| gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL); |
| if (gss_auth != NULL) |
| goto out; |
| new = gss_create_new(args, clnt); |
| if (IS_ERR(new)) |
| return new; |
| gss_auth = gss_auth_find_or_add_hashed(args, clnt, new); |
| if (gss_auth != new) |
| gss_destroy(&new->rpc_auth); |
| out: |
| return gss_auth; |
| } |
| |
| static struct rpc_auth * |
| gss_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) |
| { |
| struct gss_auth *gss_auth; |
| struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch); |
| |
| while (clnt != clnt->cl_parent) { |
| struct rpc_clnt *parent = clnt->cl_parent; |
| /* Find the original parent for this transport */ |
| if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps) |
| break; |
| clnt = parent; |
| } |
| |
| gss_auth = gss_create_hashed(args, clnt); |
| if (IS_ERR(gss_auth)) |
| return ERR_CAST(gss_auth); |
| return &gss_auth->rpc_auth; |
| } |
| |
| /* |
| * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call |
| * to the server with the GSS control procedure field set to |
| * RPC_GSS_PROC_DESTROY. This should normally cause the server to release |
| * all RPCSEC_GSS state associated with that context. |
| */ |
| static int |
| gss_destroying_context(struct rpc_cred *cred) |
| { |
| struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
| struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
| struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1); |
| struct rpc_task *task; |
| |
| if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) |
| return 0; |
| |
| ctx->gc_proc = RPC_GSS_PROC_DESTROY; |
| cred->cr_ops = &gss_nullops; |
| |
| /* Take a reference to ensure the cred will be destroyed either |
| * by the RPC call or by the put_rpccred() below */ |
| get_rpccred(cred); |
| |
| task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); |
| if (!IS_ERR(task)) |
| rpc_put_task(task); |
| |
| put_rpccred(cred); |
| return 1; |
| } |
| |
| /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure |
| * to create a new cred or context, so they check that things have been |
| * allocated before freeing them. */ |
| static void |
| gss_do_free_ctx(struct gss_cl_ctx *ctx) |
| { |
| dprintk("RPC: %s\n", __func__); |
| |
| gss_delete_sec_context(&ctx->gc_gss_ctx); |
| kfree(ctx->gc_wire_ctx.data); |
| kfree(ctx->gc_acceptor.data); |
| kfree(ctx); |
| } |
| |
| static void |
| gss_free_ctx_callback(struct rcu_head *head) |
| { |
| struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); |
| gss_do_free_ctx(ctx); |
| } |
| |
| static void |
| gss_free_ctx(struct gss_cl_ctx *ctx) |
| { |
| call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); |
| } |
| |
| static void |
| gss_free_cred(struct gss_cred *gss_cred) |
| { |
| dprintk("RPC: %s cred=%p\n", __func__, gss_cred); |
| kfree(gss_cred); |
| } |
| |
| static void |
| gss_free_cred_callback(struct rcu_head *head) |
| { |
| struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); |
| gss_free_cred(gss_cred); |
| } |
| |
| static void |
| gss_destroy_nullcred(struct rpc_cred *cred) |
| { |
| struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
| struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
| struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1); |
| |
| RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); |
| call_rcu(&cred->cr_rcu, gss_free_cred_callback); |
| if (ctx) |
| gss_put_ctx(ctx); |
| gss_put_auth(gss_auth); |
| } |
| |
| static void |
| gss_destroy_cred(struct rpc_cred *cred) |
| { |
| |
| if (gss_destroying_context(cred)) |
| return; |
| gss_destroy_nullcred(cred); |
| } |
| |
| static int |
| gss_hash_cred(struct auth_cred *acred, unsigned int hashbits) |
| { |
| return hash_64(from_kuid(&init_user_ns, acred->uid), hashbits); |
| } |
| |
| /* |
| * Lookup RPCSEC_GSS cred for the current process |
| */ |
| static struct rpc_cred * |
| gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
| { |
| return rpcauth_lookup_credcache(auth, acred, flags, GFP_NOFS); |
| } |
| |
| static struct rpc_cred * |
| gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags, gfp_t gfp) |
| { |
| struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
| struct gss_cred *cred = NULL; |
| int err = -ENOMEM; |
| |
| dprintk("RPC: %s for uid %d, flavor %d\n", |
| __func__, from_kuid(&init_user_ns, acred->uid), |
| auth->au_flavor); |
| |
| if (!(cred = kzalloc(sizeof(*cred), gfp))) |
| goto out_err; |
| |
| rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
| /* |
| * Note: in order to force a call to call_refresh(), we deliberately |
| * fail to flag the credential as RPCAUTH_CRED_UPTODATE. |
| */ |
| cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
| cred->gc_service = gss_auth->service; |
| cred->gc_principal = NULL; |
| if (acred->machine_cred) |
| cred->gc_principal = acred->principal; |
| kref_get(&gss_auth->kref); |
| return &cred->gc_base; |
| |
| out_err: |
| dprintk("RPC: %s failed with error %d\n", __func__, err); |
| return ERR_PTR(err); |
| } |
| |
| static int |
| gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) |
| { |
| struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
| struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); |
| int err; |
| |
| do { |
| err = gss_create_upcall(gss_auth, gss_cred); |
| } while (err == -EAGAIN); |
| return err; |
| } |
| |
| static char * |
| gss_stringify_acceptor(struct rpc_cred *cred) |
| { |
| char *string = NULL; |
| struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
| struct gss_cl_ctx *ctx; |
| unsigned int len; |
| struct xdr_netobj *acceptor; |
| |
| rcu_read_lock(); |
| ctx = rcu_dereference(gss_cred->gc_ctx); |
| if (!ctx) |
| goto out; |
| |
| len = ctx->gc_acceptor.len; |
| rcu_read_unlock(); |
| |
| /* no point if there's no string */ |
| if (!len) |
| return NULL; |
| realloc: |
| string = kmalloc(len + 1, GFP_KERNEL); |
| if (!string) |
| return NULL; |
| |
| rcu_read_lock(); |
| ctx = rcu_dereference(gss_cred->gc_ctx); |
| |
| /* did the ctx disappear or was it replaced by one with no acceptor? */ |
| if (!ctx || !ctx->gc_acceptor.len) { |
| kfree(string); |
| string = NULL; |
| goto out; |
| } |
| |
| acceptor = &ctx->gc_acceptor; |
| |
| /* |
| * Did we find a new acceptor that's longer than the original? Allocate |
| * a longer buffer and try again. |
| */ |
| if (len < acceptor->len) { |
| len = acceptor->len; |
| rcu_read_unlock(); |
| kfree(string); |
| goto realloc; |
| } |
| |
| memcpy(string, acceptor->data, acceptor->len); |
| string[acceptor->len] = '\0'; |
| out: |
| rcu_read_unlock(); |
| return string; |
| } |
| |
| /* |
| * Returns -EACCES if GSS context is NULL or will expire within the |
| * timeout (miliseconds) |
| */ |
| static int |
| gss_key_timeout(struct rpc_cred *rc) |
| { |
| struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); |
| struct gss_cl_ctx *ctx; |
| unsigned long timeout = jiffies + (gss_key_expire_timeo * HZ); |
| int ret = 0; |
| |
| rcu_read_lock(); |
| ctx = rcu_dereference(gss_cred->gc_ctx); |
| if (!ctx || time_after(timeout, ctx->gc_expiry)) |
| ret = -EACCES; |
| rcu_read_unlock(); |
| |
| return ret; |
| } |
| |
| static int |
| gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
| { |
| struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); |
| struct gss_cl_ctx *ctx; |
| int ret; |
| |
| if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
| goto out; |
| /* Don't match with creds that have expired. */ |
| rcu_read_lock(); |
| ctx = rcu_dereference(gss_cred->gc_ctx); |
| if (!ctx || time_after(jiffies, ctx->gc_expiry)) { |
| rcu_read_unlock(); |
| return 0; |
| } |
| rcu_read_unlock(); |
| if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) |
| return 0; |
| out: |
| if (acred->principal != NULL) { |
| if (gss_cred->gc_principal == NULL) |
| return 0; |
| ret = strcmp(acred->principal, gss_cred->gc_principal) == 0; |
| goto check_expire; |
| } |
| if (gss_cred->gc_principal != NULL) |
| return 0; |
| ret = uid_eq(rc->cr_uid, acred->uid); |
| |
| check_expire: |
| if (ret == 0) |
| return ret; |
| |
| /* Notify acred users of GSS context expiration timeout */ |
| if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags) && |
| (gss_key_timeout(rc) != 0)) { |
| /* test will now be done from generic cred */ |
| test_and_clear_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags); |
| /* tell NFS layer that key will expire soon */ |
| set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags); |
| } |
| return ret; |
| } |
| |
| /* |
| * Marshal credentials. |
| * Maybe we should keep a cached credential for performance reasons. |
| */ |
| static __be32 * |
| gss_marshal(struct rpc_task *task, __be32 *p) |
| { |
| struct rpc_rqst *req = task->tk_rqstp; |
| struct rpc_cred *cred = req->rq_cred; |
| struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
| gc_base); |
| struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
| __be32 *cred_len; |
| u32 maj_stat = 0; |
| struct xdr_netobj mic; |
| struct kvec iov; |
| struct xdr_buf verf_buf; |
| |
| dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
| |
| *p++ = htonl(RPC_AUTH_GSS); |
| cred_len = p++; |
| |
| spin_lock(&ctx->gc_seq_lock); |
| req->rq_seqno = ctx->gc_seq++; |
| spin_unlock(&ctx->gc_seq_lock); |
| |
| *p++ = htonl((u32) RPC_GSS_VERSION); |
| *p++ = htonl((u32) ctx->gc_proc); |
| *p++ = htonl((u32) req->rq_seqno); |
| *p++ = htonl((u32) gss_cred->gc_service); |
| p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); |
| *cred_len = htonl((p - (cred_len + 1)) << 2); |
| |
| /* We compute the checksum for the verifier over the xdr-encoded bytes |
| * starting with the xid and ending at the end of the credential: */ |
| iov.iov_base = xprt_skip_transport_header(req->rq_xprt, |
| req->rq_snd_buf.head[0].iov_base); |
| iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
| xdr_buf_from_iov(&iov, &verf_buf); |
| |
| /* set verifier flavor*/ |
| *p++ = htonl(RPC_AUTH_GSS); |
| |
| mic.data = (u8 *)(p + 1); |
| maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
| if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
| clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
| } else if (maj_stat != 0) { |
| printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); |
| goto out_put_ctx; |
| } |
| p = xdr_encode_opaque(p, NULL, mic.len); |
| gss_put_ctx(ctx); |
| return p; |
| out_put_ctx: |
| gss_put_ctx(ctx); |
| return NULL; |
| } |
| |
| static int gss_renew_cred(struct rpc_task *task) |
| { |
| struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; |
| struct gss_cred *gss_cred = container_of(oldcred, |
| struct gss_cred, |
| gc_base); |
| struct rpc_auth *auth = oldcred->cr_auth; |
| struct auth_cred acred = { |
| .uid = oldcred->cr_uid, |
| .principal = gss_cred->gc_principal, |
| .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0), |
| }; |
| struct rpc_cred *new; |
| |
| new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); |
| if (IS_ERR(new)) |
| return PTR_ERR(new); |
| task->tk_rqstp->rq_cred = new; |
| put_rpccred(oldcred); |
| return 0; |
| } |
| |
| static int gss_cred_is_negative_entry(struct rpc_cred *cred) |
| { |
| if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { |
| unsigned long now = jiffies; |
| unsigned long begin, expire; |
| struct gss_cred *gss_cred; |
| |
| gss_cred = container_of(cred, struct gss_cred, gc_base); |
| begin = gss_cred->gc_upcall_timestamp; |
| expire = begin + gss_expired_cred_retry_delay * HZ; |
| |
| if (time_in_range_open(now, begin, expire)) |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* |
| * Refresh credentials. XXX - finish |
| */ |
| static int |
| gss_refresh(struct rpc_task *task) |
| { |
| struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
| int ret = 0; |
| |
| if (gss_cred_is_negative_entry(cred)) |
| return -EKEYEXPIRED; |
| |
| if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && |
| !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { |
| ret = gss_renew_cred(task); |
| if (ret < 0) |
| goto out; |
| cred = task->tk_rqstp->rq_cred; |
| } |
| |
| if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
| ret = gss_refresh_upcall(task); |
| out: |
| return ret; |
| } |
| |
| /* Dummy refresh routine: used only when destroying the context */ |
| static int |
| gss_refresh_null(struct rpc_task *task) |
| { |
| return 0; |
| } |
| |
| static __be32 * |
| gss_validate(struct rpc_task *task, __be32 *p) |
| { |
| struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
| struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
| __be32 *seq = NULL; |
| struct kvec iov; |
| struct xdr_buf verf_buf; |
| struct xdr_netobj mic; |
| u32 flav,len; |
| u32 maj_stat; |
| __be32 *ret = ERR_PTR(-EIO); |
| |
| dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
| |
| flav = ntohl(*p++); |
| if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) |
| goto out_bad; |
| if (flav != RPC_AUTH_GSS) |
| goto out_bad; |
| seq = kmalloc(4, GFP_NOFS); |
| if (!seq) |
| goto out_bad; |
| *seq = htonl(task->tk_rqstp->rq_seqno); |
| iov.iov_base = seq; |
| iov.iov_len = 4; |
| xdr_buf_from_iov(&iov, &verf_buf); |
| mic.data = (u8 *)p; |
| mic.len = len; |
| |
| ret = ERR_PTR(-EACCES); |
| maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
| if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
| clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
| if (maj_stat) { |
| dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n", |
| task->tk_pid, __func__, maj_stat); |
| goto out_bad; |
| } |
| /* We leave it to unwrap to calculate au_rslack. For now we just |
| * calculate the length of the verifier: */ |
| cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
| gss_put_ctx(ctx); |
| dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n", |
| task->tk_pid, __func__); |
| kfree(seq); |
| return p + XDR_QUADLEN(len); |
| out_bad: |
| gss_put_ctx(ctx); |
| dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__, |
| PTR_ERR(ret)); |
| kfree(seq); |
| return ret; |
| } |
| |
| static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, |
| __be32 *p, void *obj) |
| { |
| struct xdr_stream xdr; |
| |
| xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p); |
| encode(rqstp, &xdr, obj); |
| } |
| |
| static inline int |
| gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, |
| kxdreproc_t encode, struct rpc_rqst *rqstp, |
| __be32 *p, void *obj) |
| { |
| struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; |
| struct xdr_buf integ_buf; |
| __be32 *integ_len = NULL; |
| struct xdr_netobj mic; |
| u32 offset; |
| __be32 *q; |
| struct kvec *iov; |
| u32 maj_stat = 0; |
| int status = -EIO; |
| |
| integ_len = p++; |
| offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; |
| *p++ = htonl(rqstp->rq_seqno); |
| |
| gss_wrap_req_encode(encode, rqstp, p, obj); |
| |
| if (xdr_buf_subsegment(snd_buf, &integ_buf, |
| offset, snd_buf->len - offset)) |
| return status; |
| *integ_len = htonl(integ_buf.len); |
| |
| /* guess whether we're in the head or the tail: */ |
| if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
| iov = snd_buf->tail; |
| else |
| iov = snd_buf->head; |
| p = iov->iov_base + iov->iov_len; |
| mic.data = (u8 *)(p + 1); |
| |
| maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
| status = -EIO; /* XXX? */ |
| if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
| clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
| else if (maj_stat) |
| return status; |
| q = xdr_encode_opaque(p, NULL, mic.len); |
| |
| offset = (u8 *)q - (u8 *)p; |
| iov->iov_len += offset; |
| snd_buf->len += offset; |
| return 0; |
| } |
| |
| static void |
| priv_release_snd_buf(struct rpc_rqst *rqstp) |
| { |
| int i; |
| |
| for (i=0; i < rqstp->rq_enc_pages_num; i++) |
| __free_page(rqstp->rq_enc_pages[i]); |
| kfree(rqstp->rq_enc_pages); |
| } |
| |
| static int |
| alloc_enc_pages(struct rpc_rqst *rqstp) |
| { |
| struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; |
| int first, last, i; |
| |
| if (snd_buf->page_len == 0) { |
| rqstp->rq_enc_pages_num = 0; |
| return 0; |
| } |
| |
| first = snd_buf->page_base >> PAGE_SHIFT; |
| last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_SHIFT; |
| rqstp->rq_enc_pages_num = last - first + 1 + 1; |
| rqstp->rq_enc_pages |
| = kmalloc_array(rqstp->rq_enc_pages_num, |
| sizeof(struct page *), |
| GFP_NOFS); |
| if (!rqstp->rq_enc_pages) |
| goto out; |
| for (i=0; i < rqstp->rq_enc_pages_num; i++) { |
| rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); |
| if (rqstp->rq_enc_pages[i] == NULL) |
| goto out_free; |
| } |
| rqstp->rq_release_snd_buf = priv_release_snd_buf; |
| return 0; |
| out_free: |
| rqstp->rq_enc_pages_num = i; |
| priv_release_snd_buf(rqstp); |
| out: |
| return -EAGAIN; |
| } |
| |
| static inline int |
| gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, |
| kxdreproc_t encode, struct rpc_rqst *rqstp, |
| __be32 *p, void *obj) |
| { |
| struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; |
| u32 offset; |
| u32 maj_stat; |
| int status; |
| __be32 *opaque_len; |
| struct page **inpages; |
| int first; |
| int pad; |
| struct kvec *iov; |
| char *tmp; |
| |
| opaque_len = p++; |
| offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; |
| *p++ = htonl(rqstp->rq_seqno); |
| |
| gss_wrap_req_encode(encode, rqstp, p, obj); |
| |
| status = alloc_enc_pages(rqstp); |
| if (status) |
| return status; |
| first = snd_buf->page_base >> PAGE_SHIFT; |
| inpages = snd_buf->pages + first; |
| snd_buf->pages = rqstp->rq_enc_pages; |
| snd_buf->page_base -= first << PAGE_SHIFT; |
| /* |
| * Give the tail its own page, in case we need extra space in the |
| * head when wrapping: |
| * |
| * call_allocate() allocates twice the slack space required |
| * by the authentication flavor to rq_callsize. |
| * For GSS, slack is GSS_CRED_SLACK. |
| */ |
| if (snd_buf->page_len || snd_buf->tail[0].iov_len) { |
| tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); |
| memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); |
| snd_buf->tail[0].iov_base = tmp; |
| } |
| maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
| /* slack space should prevent this ever happening: */ |
| BUG_ON(snd_buf->len > snd_buf->buflen); |
| status = -EIO; |
| /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
| * done anyway, so it's safe to put the request on the wire: */ |
| if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
| clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
| else if (maj_stat) |
| return status; |
| |
| *opaque_len = htonl(snd_buf->len - offset); |
| /* guess whether we're in the head or the tail: */ |
| if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
| iov = snd_buf->tail; |
| else |
| iov = snd_buf->head; |
| p = iov->iov_base + iov->iov_len; |
| pad = 3 - ((snd_buf->len - offset - 1) & 3); |
| memset(p, 0, pad); |
| iov->iov_len += pad; |
| snd_buf->len += pad; |
| |
| return 0; |
| } |
| |
| static int |
| gss_wrap_req(struct rpc_task *task, |
| kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) |
| { |
| struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
| struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
| gc_base); |
| struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
| int status = -EIO; |
| |
| dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
| if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
| /* The spec seems a little ambiguous here, but I think that not |
| * wrapping context destruction requests makes the most sense. |
| */ |
| gss_wrap_req_encode(encode, rqstp, p, obj); |
| status = 0; |
| goto out; |
| } |
| switch (gss_cred->gc_service) { |
| case RPC_GSS_SVC_NONE: |
| gss_wrap_req_encode(encode, rqstp, p, obj); |
| status = 0; |
| break; |
| case RPC_GSS_SVC_INTEGRITY: |
| status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj); |
| break; |
| case RPC_GSS_SVC_PRIVACY: |
| status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj); |
| break; |
| } |
| out: |
| gss_put_ctx(ctx); |
| dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status); |
| return status; |
| } |
| |
| static inline int |
| gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, |
| struct rpc_rqst *rqstp, __be32 **p) |
| { |
| struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; |
| struct xdr_buf integ_buf; |
| struct xdr_netobj mic; |
| u32 data_offset, mic_offset; |
| u32 integ_len; |
| u32 maj_stat; |
| int status = -EIO; |
| |
| integ_len = ntohl(*(*p)++); |
| if (integ_len & 3) |
| return status; |
| data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; |
| mic_offset = integ_len + data_offset; |
| if (mic_offset > rcv_buf->len) |
| return status; |
| if (ntohl(*(*p)++) != rqstp->rq_seqno) |
| return status; |
| |
| if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, |
| mic_offset - data_offset)) |
| return status; |
| |
| if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) |
| return status; |
| |
| maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
| if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
| clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
| if (maj_stat != GSS_S_COMPLETE) |
| return status; |
| return 0; |
| } |
| |
| static inline int |
| gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, |
| struct rpc_rqst *rqstp, __be32 **p) |
| { |
| struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; |
| u32 offset; |
| u32 opaque_len; |
| u32 maj_stat; |
| int status = -EIO; |
| |
| opaque_len = ntohl(*(*p)++); |
| offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; |
| if (offset + opaque_len > rcv_buf->len) |
| return status; |
| /* remove padding: */ |
| rcv_buf->len = offset + opaque_len; |
| |
| maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
| if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
| clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
| if (maj_stat != GSS_S_COMPLETE) |
| return status; |
| if (ntohl(*(*p)++) != rqstp->rq_seqno) |
| return status; |
| |
| return 0; |
| } |
| |
| static int |
| gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, |
| __be32 *p, void *obj) |
| { |
| struct xdr_stream xdr; |
| |
| xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); |
| return decode(rqstp, &xdr, obj); |
| } |
| |
| static int |
| gss_unwrap_resp(struct rpc_task *task, |
| kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) |
| { |
| struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
| struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
| gc_base); |
| struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
| __be32 *savedp = p; |
| struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
| int savedlen = head->iov_len; |
| int status = -EIO; |
| |
| if (ctx->gc_proc != RPC_GSS_PROC_DATA) |
| goto out_decode; |
| switch (gss_cred->gc_service) { |
| case RPC_GSS_SVC_NONE: |
| break; |
| case RPC_GSS_SVC_INTEGRITY: |
| status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); |
| if (status) |
| goto out; |
| break; |
| case RPC_GSS_SVC_PRIVACY: |
| status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); |
| if (status) |
| goto out; |
| break; |
| } |
| /* take into account extra slack for integrity and privacy cases: */ |
| cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) |
| + (savedlen - head->iov_len); |
| out_decode: |
| status = gss_unwrap_req_decode(decode, rqstp, p, obj); |
| out: |
| gss_put_ctx(ctx); |
| dprintk("RPC: %5u %s returning %d\n", |
| task->tk_pid, __func__, status); |
| return status; |
| } |
| |
| static const struct rpc_authops authgss_ops = { |
| .owner = THIS_MODULE, |
| .au_flavor = RPC_AUTH_GSS, |
| .au_name = "RPCSEC_GSS", |
| .create = gss_create, |
| .destroy = gss_destroy, |
| .hash_cred = gss_hash_cred, |
| .lookup_cred = gss_lookup_cred, |
| .crcreate = gss_create_cred, |
| .list_pseudoflavors = gss_mech_list_pseudoflavors, |
| .info2flavor = gss_mech_info2flavor, |
| .flavor2info = gss_mech_flavor2info, |
| }; |
| |
| static const struct rpc_credops gss_credops = { |
| .cr_name = "AUTH_GSS", |
| .crdestroy = gss_destroy_cred, |
| .cr_init = gss_cred_init, |
| .crbind = rpcauth_generic_bind_cred, |
| .crmatch = gss_match, |
| .crmarshal = gss_marshal, |
| .crrefresh = gss_refresh, |
| .crvalidate = gss_validate, |
| .crwrap_req = gss_wrap_req, |
| .crunwrap_resp = gss_unwrap_resp, |
| .crkey_timeout = gss_key_timeout, |
| .crstringify_acceptor = gss_stringify_acceptor, |
| }; |
| |
| static const struct rpc_credops gss_nullops = { |
| .cr_name = "AUTH_GSS", |
| .crdestroy = gss_destroy_nullcred, |
| .crbind = rpcauth_generic_bind_cred, |
| .crmatch = gss_match, |
| .crmarshal = gss_marshal, |
| .crrefresh = gss_refresh_null, |
| .crvalidate = gss_validate, |
| .crwrap_req = gss_wrap_req, |
| .crunwrap_resp = gss_unwrap_resp, |
| .crstringify_acceptor = gss_stringify_acceptor, |
| }; |
| |
| static const struct rpc_pipe_ops gss_upcall_ops_v0 = { |
| .upcall = rpc_pipe_generic_upcall, |
| .downcall = gss_pipe_downcall, |
| .destroy_msg = gss_pipe_destroy_msg, |
| .open_pipe = gss_pipe_open_v0, |
| .release_pipe = gss_pipe_release, |
| }; |
| |
| static const struct rpc_pipe_ops gss_upcall_ops_v1 = { |
| .upcall = rpc_pipe_generic_upcall, |
| .downcall = gss_pipe_downcall, |
| .destroy_msg = gss_pipe_destroy_msg, |
| .open_pipe = gss_pipe_open_v1, |
| .release_pipe = gss_pipe_release, |
| }; |
| |
| static __net_init int rpcsec_gss_init_net(struct net *net) |
| { |
| return gss_svc_init_net(net); |
| } |
| |
| static __net_exit void rpcsec_gss_exit_net(struct net *net) |
| { |
| gss_svc_shutdown_net(net); |
| } |
| |
| static struct pernet_operations rpcsec_gss_net_ops = { |
| .init = rpcsec_gss_init_net, |
| .exit = rpcsec_gss_exit_net, |
| }; |
| |
| /* |
| * Initialize RPCSEC_GSS module |
| */ |
| static int __init init_rpcsec_gss(void) |
| { |
| int err = 0; |
| |
| err = rpcauth_register(&authgss_ops); |
| if (err) |
| goto out; |
| err = gss_svc_init(); |
| if (err) |
| goto out_unregister; |
| err = register_pernet_subsys(&rpcsec_gss_net_ops); |
| if (err) |
| goto out_svc_exit; |
| rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); |
| return 0; |
| out_svc_exit: |
| gss_svc_shutdown(); |
| out_unregister: |
| rpcauth_unregister(&authgss_ops); |
| out: |
| return err; |
| } |
| |
| static void __exit exit_rpcsec_gss(void) |
| { |
| unregister_pernet_subsys(&rpcsec_gss_net_ops); |
| gss_svc_shutdown(); |
| rpcauth_unregister(&authgss_ops); |
| rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
| } |
| |
| MODULE_ALIAS("rpc-auth-6"); |
| MODULE_LICENSE("GPL"); |
| module_param_named(expired_cred_retry_delay, |
| gss_expired_cred_retry_delay, |
| uint, 0644); |
| MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " |
| "the RPC engine retries an expired credential"); |
| |
| module_param_named(key_expire_timeo, |
| gss_key_expire_timeo, |
| uint, 0644); |
| MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a " |
| "credential keys lifetime where the NFS layer cleans up " |
| "prior to key expiration"); |
| |
| module_init(init_rpcsec_gss) |
| module_exit(exit_rpcsec_gss) |