diff options
Diffstat (limited to 'net/sunrpc/auth_gss/auth_gss.c')
| -rw-r--r-- | net/sunrpc/auth_gss/auth_gss.c | 1224 |
1 files changed, 943 insertions, 281 deletions
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c index 6dac3879228..b6e440baccc 100644 --- a/net/sunrpc/auth_gss/auth_gss.c +++ b/net/sunrpc/auth_gss/auth_gss.c @@ -33,8 +33,6 @@ * 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. - * - * $Id$ */ @@ -53,43 +51,68 @@ #include <linux/sunrpc/rpc_pipe_fs.h> #include <linux/sunrpc/gss_api.h> #include <asm/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; + #ifdef RPC_DEBUG # define RPCDBG_FACILITY RPCDBG_AUTH #endif -#define NFS_NGROUPS 16 - -#define GSS_CRED_SLACK 1024 /* XXX: unused */ +#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 -/* XXX this define must match the gssd define -* as it is passed to gssd to signal the use of -* machine creds should be part of the shared rpc interface */ +static DEFINE_HASHTABLE(gss_auth_hash_table, 4); +static DEFINE_SPINLOCK(gss_auth_hash_lock); -#define CA_RUN_AS_MACHINE 0x00000200 - -/* dump the buffer in `emacs-hexl' style */ -#define isprint(c) ((c > 0x1f) && (c < 0x7f)) +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 dentry *dentry; + 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 struct rpc_pipe_ops gss_upcall_ops; +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) @@ -108,33 +131,20 @@ gss_put_ctx(struct gss_cl_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 inode->i_lock. + * 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); - struct gss_cl_ctx *old; - old = gss_cred->gc_ctx; + 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); - if (old) - gss_put_ctx(old); -} - -static int -gss_cred_is_uptodate_ctx(struct rpc_cred *cred) -{ - struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); - int res = 0; - - rcu_read_lock(); - if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) && gss_cred->gc_ctx) - res = 1; - rcu_read_unlock(); - return res; } static const void * @@ -159,7 +169,7 @@ simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) q = (const void *)((const char *)p + len); if (unlikely(q > end || q < p)) return ERR_PTR(-EFAULT); - dest->data = kmemdup(p, len, GFP_KERNEL); + dest->data = kmemdup(p, len, GFP_NOFS); if (unlikely(dest->data == NULL)) return ERR_PTR(-ENOMEM); dest->len = len; @@ -184,7 +194,7 @@ gss_alloc_context(void) { struct gss_cl_ctx *ctx; - ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); + 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 */ @@ -201,25 +211,37 @@ gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct const void *q; unsigned int seclen; unsigned int timeout; + unsigned long now = jiffies; u32 window_size; int ret; - /* First unsigned int gives the lifetime (in seconds) of the cred */ + /* 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 = jiffies + (unsigned long)timeout * HZ * 3 / 4; - /* Sequence number window. Determines the maximum number of simultaneous requests */ + 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 which we ignore */ - p = ERR_PTR(-EACCES); + /* + * 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 */ @@ -235,74 +257,107 @@ gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct p = ERR_PTR(-EFAULT); goto err; } - ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); + ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS); if (ret < 0) { p = ERR_PTR(ret); goto err; } + dprintk("RPC: %s Success. gc_expiry %lu now %lu timeout %u\n", + __func__, ctx->gc_expiry, now, timeout); return q; err: - dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); + dprintk("RPC: %s returns error %ld\n", __func__, -PTR_ERR(p)); return p; } +#define UPCALL_BUF_LEN 128 struct gss_upcall_msg { atomic_t count; - uid_t uid; + 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 (!atomic_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_inode *rpci, uid_t uid) +__gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid) { struct gss_upcall_msg *pos; - list_for_each_entry(pos, &rpci->in_downcall, list) { - if (pos->uid != uid) + list_for_each_entry(pos, &pipe->in_downcall, list) { + if (!uid_eq(pos->uid, uid)) continue; atomic_inc(&pos->count); - dprintk("RPC: gss_find_upcall found msg %p\n", pos); + dprintk("RPC: %s found msg %p\n", __func__, pos); return pos; } - dprintk("RPC: gss_find_upcall found nothing\n"); + dprintk("RPC: %s found nothing\n", __func__); return NULL; } -/* Try to add a upcall to the pipefs queue. +/* 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_auth *gss_auth, struct gss_upcall_msg *gss_msg) +gss_add_msg(struct gss_upcall_msg *gss_msg) { - struct inode *inode = gss_auth->dentry->d_inode; - struct rpc_inode *rpci = RPC_I(inode); + struct rpc_pipe *pipe = gss_msg->pipe; struct gss_upcall_msg *old; - spin_lock(&inode->i_lock); - old = __gss_find_upcall(rpci, gss_msg->uid); + spin_lock(&pipe->lock); + old = __gss_find_upcall(pipe, gss_msg->uid); if (old == NULL) { atomic_inc(&gss_msg->count); - list_add(&gss_msg->list, &rpci->in_downcall); + list_add(&gss_msg->list, &pipe->in_downcall); } else gss_msg = old; - spin_unlock(&inode->i_lock); + spin_unlock(&pipe->lock); return gss_msg; } @@ -318,66 +373,159 @@ __gss_unhash_msg(struct gss_upcall_msg *gss_msg) static void gss_unhash_msg(struct gss_upcall_msg *gss_msg) { - struct gss_auth *gss_auth = gss_msg->auth; - struct inode *inode = gss_auth->dentry->d_inode; + struct rpc_pipe *pipe = gss_msg->pipe; if (list_empty(&gss_msg->list)) return; - spin_lock(&inode->i_lock); + spin_lock(&pipe->lock); if (!list_empty(&gss_msg->list)) __gss_unhash_msg(gss_msg); - spin_unlock(&inode->i_lock); + 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_msg.rpc_cred, + 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 inode *inode = gss_msg->auth->dentry->d_inode; + struct rpc_pipe *pipe = gss_msg->pipe; - spin_lock(&inode->i_lock); - if (gss_msg->ctx) - gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx)); - else - task->tk_status = gss_msg->msg.errno; - gss_cred->gc_upcall = NULL; - rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); - spin_unlock(&inode->i_lock); + 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 inline struct gss_upcall_msg * -gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) +static void gss_encode_v0_msg(struct gss_upcall_msg *gss_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)); +} - gss_msg = kzalloc(sizeof(*gss_msg), GFP_KERNEL); - if (gss_msg != NULL) { - INIT_LIST_HEAD(&gss_msg->list); - rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); - init_waitqueue_head(&gss_msg->waitqueue); - atomic_set(&gss_msg->count, 1); - gss_msg->msg.data = &gss_msg->uid; - gss_msg->msg.len = sizeof(gss_msg->uid); - gss_msg->uid = uid; - gss_msg->auth = gss_auth; +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); + atomic_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 rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) +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, cred->cr_uid); - if (gss_new == NULL) - return ERR_PTR(-ENOMEM); - gss_msg = gss_add_msg(gss_auth, gss_new); + 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 = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); + int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); if (res) { gss_unhash_msg(gss_new); gss_msg = ERR_PTR(res); @@ -387,106 +535,125 @@ gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cr 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_msg.rpc_cred; + 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 inode *inode = gss_auth->dentry->d_inode; + struct rpc_pipe *pipe; int err = 0; - dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, - cred->cr_uid); - gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); + 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; } - spin_lock(&inode->i_lock); + 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, 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 */ atomic_inc(&gss_msg->count); - rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL); - } else + 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(&inode->i_lock); + } + spin_unlock(&pipe->lock); gss_release_msg(gss_msg); out: - dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", - task->tk_pid, cred->cr_uid, err); + 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 inode *inode = gss_auth->dentry->d_inode; + 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 = 0; + int err; - dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); - gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); + 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_INTERRUPTIBLE); - spin_lock(&inode->i_lock); + 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(&inode->i_lock); - if (signalled()) { + 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_get_ctx(gss_msg->ctx)); + gss_cred_set_ctx(cred, gss_msg->ctx); else err = gss_msg->msg.errno; - spin_unlock(&inode->i_lock); + spin_unlock(&pipe->lock); out_intr: finish_wait(&gss_msg->waitqueue, &wait); gss_release_msg(gss_msg); out: - dprintk("RPC: gss_create_upcall for uid %u result %d\n", - cred->cr_uid, err); + dprintk("RPC: %s for uid %u result %d\n", + __func__, from_kuid(&init_user_ns, cred->cr_uid), err); return err; } -static ssize_t -gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, - char __user *dst, size_t buflen) -{ - char *data = (char *)msg->data + msg->copied; - size_t mlen = min(msg->len, buflen); - unsigned long left; - - left = copy_to_user(dst, data, mlen); - if (left == mlen) { - msg->errno = -EFAULT; - return -EFAULT; - } - - mlen -= left; - msg->copied += mlen; - msg->errno = 0; - return mlen; -} - #define MSG_BUF_MAXSIZE 1024 static ssize_t @@ -494,32 +661,37 @@ gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) { const void *p, *end; void *buf; - struct rpc_clnt *clnt; struct gss_upcall_msg *gss_msg; - struct inode *inode = filp->f_path.dentry->d_inode; + struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe; struct gss_cl_ctx *ctx; - uid_t uid; + uid_t id; + kuid_t uid; ssize_t err = -EFBIG; if (mlen > MSG_BUF_MAXSIZE) goto out; err = -ENOMEM; - buf = kmalloc(mlen, GFP_KERNEL); + buf = kmalloc(mlen, GFP_NOFS); if (!buf) goto out; - clnt = RPC_I(inode)->private; err = -EFAULT; if (copy_from_user(buf, src, mlen)) goto err; end = (const void *)((char *)buf + mlen); - p = simple_get_bytes(buf, end, &uid, sizeof(uid)); + 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) @@ -527,90 +699,276 @@ gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) err = -ENOENT; /* Find a matching upcall */ - spin_lock(&inode->i_lock); - gss_msg = __gss_find_upcall(RPC_I(inode), uid); + spin_lock(&pipe->lock); + gss_msg = __gss_find_upcall(pipe, uid); if (gss_msg == NULL) { - spin_unlock(&inode->i_lock); + spin_unlock(&pipe->lock); goto err_put_ctx; } list_del_init(&gss_msg->list); - spin_unlock(&inode->i_lock); + spin_unlock(&pipe->lock); p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); if (IS_ERR(p)) { err = PTR_ERR(p); - gss_msg->msg.errno = (err == -EAGAIN) ? -EAGAIN : -EACCES; + 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); + BUG(); + } goto err_release_msg; } gss_msg->ctx = gss_get_ctx(ctx); err = mlen; err_release_msg: - spin_lock(&inode->i_lock); + spin_lock(&pipe->lock); __gss_unhash_msg(gss_msg); - spin_unlock(&inode->i_lock); + spin_unlock(&pipe->lock); gss_release_msg(gss_msg); err_put_ctx: gss_put_ctx(ctx); err: kfree(buf); out: - dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); + 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 rpc_inode *rpci = RPC_I(inode); + struct net *net = inode->i_sb->s_fs_info; + struct rpc_pipe *pipe = RPC_I(inode)->pipe; struct gss_upcall_msg *gss_msg; - spin_lock(&inode->i_lock); - while (!list_empty(&rpci->in_downcall)) { +restart: + spin_lock(&pipe->lock); + list_for_each_entry(gss_msg, &pipe->in_downcall, list) { - gss_msg = list_entry(rpci->in_downcall.next, - struct gss_upcall_msg, list); + if (!list_empty(&gss_msg->msg.list)) + continue; gss_msg->msg.errno = -EPIPE; atomic_inc(&gss_msg->count); __gss_unhash_msg(gss_msg); - spin_unlock(&inode->i_lock); + spin_unlock(&pipe->lock); gss_release_msg(gss_msg); - spin_lock(&inode->i_lock); + goto restart; } - spin_unlock(&inode->i_lock); + 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); - static unsigned long ratelimit; if (msg->errno < 0) { - dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", - gss_msg); + dprintk("RPC: %s releasing msg %p\n", + __func__, gss_msg); atomic_inc(&gss_msg->count); gss_unhash_msg(gss_msg); - if (msg->errno == -ETIMEDOUT) { - unsigned long now = jiffies; - if (time_after(now, ratelimit)) { - printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" - "Please check user daemon is running!\n"); - ratelimit = now + 15*HZ; - } - } + if (msg->errno == -ETIMEDOUT) + warn_gssd(); 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 rpc_auth * -gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) +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? */ @@ -620,17 +978,26 @@ gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) 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) { - printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n", - __FUNCTION__, flavor); - goto err_free; + 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; @@ -639,23 +1006,41 @@ gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) atomic_set(&auth->au_count, 1); kref_init(&gss_auth->kref); - gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, - clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); - if (IS_ERR(gss_auth->dentry)) { - err = PTR_ERR(gss_auth->dentry); + 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; - err = rpcauth_init_credcache(auth); - if (err) - goto err_unlink_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 auth; -err_unlink_pipe: - rpc_unlink(gss_auth->dentry); + 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); @@ -665,9 +1050,11 @@ out_dec: static void gss_free(struct gss_auth *gss_auth) { - rpc_unlink(gss_auth->dentry); - gss_auth->dentry = NULL; + 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); @@ -682,17 +1069,118 @@ gss_free_callback(struct kref *kref) } 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; + 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_auth = container_of(auth, struct gss_auth, rpc_auth); - kref_put(&gss_auth->kref, gss_free_callback); + 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 *xprt = rcu_access_pointer(clnt->cl_xprt); + + 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_xprt) != xprt) + 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; } /* @@ -709,7 +1197,7 @@ gss_destroying_context(struct rpc_cred *cred) struct rpc_task *task; if (gss_cred->gc_ctx == NULL || - gss_cred->gc_ctx->gc_proc == RPC_GSS_PROC_DESTROY) + test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) return 0; gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; @@ -719,7 +1207,7 @@ gss_destroying_context(struct rpc_cred *cred) * by the RPC call or by the put_rpccred() below */ get_rpccred(cred); - task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC); + task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); if (!IS_ERR(task)) rpc_put_task(task); @@ -733,8 +1221,9 @@ gss_destroying_context(struct rpc_cred *cred) static void gss_do_free_ctx(struct gss_cl_ctx *ctx) { - dprintk("RPC: gss_free_ctx\n"); + dprintk("RPC: %s\n", __func__); + gss_delete_sec_context(&ctx->gc_gss_ctx); kfree(ctx->gc_wire_ctx.data); kfree(ctx); } @@ -749,19 +1238,13 @@ gss_free_ctx_callback(struct rcu_head *head) static void gss_free_ctx(struct gss_cl_ctx *ctx) { - struct gss_ctx *gc_gss_ctx; - - gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx); - rcu_assign_pointer(ctx->gc_gss_ctx, NULL); call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); - if (gc_gss_ctx) - gss_delete_sec_context(&gc_gss_ctx); } static void gss_free_cred(struct gss_cred *gss_cred) { - dprintk("RPC: gss_free_cred %p\n", gss_cred); + dprintk("RPC: %s cred=%p\n", __func__, gss_cred); kfree(gss_cred); } @@ -773,19 +1256,26 @@ gss_free_cred_callback(struct rcu_head *head) } static void -gss_destroy_cred(struct rpc_cred *cred) +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 = gss_cred->gc_ctx; - if (gss_destroying_context(cred)) - return; - rcu_assign_pointer(gss_cred->gc_ctx, NULL); + RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); call_rcu(&cred->cr_rcu, gss_free_cred_callback); if (ctx) gss_put_ctx(ctx); - kref_put(&gss_auth->kref, gss_free_callback); + gss_put_auth(gss_auth); +} + +static void +gss_destroy_cred(struct rpc_cred *cred) +{ + + if (gss_destroying_context(cred)) + return; + gss_destroy_nullcred(cred); } /* @@ -804,10 +1294,11 @@ gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) struct gss_cred *cred = NULL; int err = -ENOMEM; - dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", - acred->uid, auth->au_flavor); + 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_KERNEL))) + if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) goto out_err; rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); @@ -817,11 +1308,14 @@ gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) */ 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: gss_create_cred failed with error %d\n", err); + dprintk("RPC: %s failed with error %d\n", __func__, err); return ERR_PTR(err); } @@ -838,23 +1332,64 @@ gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) return err; } +/* + * 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); + unsigned long now = jiffies; + unsigned long expire; + + if (gss_cred->gc_ctx == NULL) + return -EACCES; + + expire = gss_cred->gc_ctx->gc_expiry - (gss_key_expire_timeo * HZ); + + if (time_after(now, expire)) + return -EACCES; + return 0; +} + 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); + int ret; - /* - * If the searchflags have set RPCAUTH_LOOKUP_NEW, then - * we don't really care if the credential has expired or not, - * since the caller should be prepared to reinitialise it. - */ - if ((flags & RPCAUTH_LOOKUP_NEW) && test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) + if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) goto out; /* Don't match with creds that have expired. */ - if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) + if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) + return 0; + if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) return 0; out: - return (rc->cr_uid == acred->uid); + 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; } /* @@ -864,18 +1399,18 @@ out: static __be32 * gss_marshal(struct rpc_task *task, __be32 *p) { - struct rpc_cred *cred = task->tk_msg.rpc_cred; + 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; - struct rpc_rqst *req = task->tk_rqstp; u32 maj_stat = 0; struct xdr_netobj mic; struct kvec iov; struct xdr_buf verf_buf; - dprintk("RPC: %5u gss_marshal\n", task->tk_pid); + dprintk("RPC: %5u %s\n", task->tk_pid, __func__); *p++ = htonl(RPC_AUTH_GSS); cred_len = p++; @@ -893,7 +1428,7 @@ gss_marshal(struct rpc_task *task, __be32 *p) /* 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(task->tk_xprt, + 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); @@ -917,29 +1452,82 @@ out_put_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 (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred)) - return gss_refresh_upcall(task); - return 0; + 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 -EACCES; + return 0; } static __be32 * gss_validate(struct rpc_task *task, __be32 *p) { - struct rpc_cred *cred = task->tk_msg.rpc_cred; + struct rpc_cred *cred = task->tk_rqstp->rq_cred; struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); __be32 seq; struct kvec iov; @@ -947,8 +1535,9 @@ gss_validate(struct rpc_task *task, __be32 *p) struct xdr_netobj mic; u32 flav,len; u32 maj_stat; + __be32 *ret = ERR_PTR(-EIO); - dprintk("RPC: %5u gss_validate\n", task->tk_pid); + dprintk("RPC: %5u %s\n", task->tk_pid, __func__); flav = ntohl(*p++); if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) @@ -962,30 +1551,42 @@ gss_validate(struct rpc_task *task, __be32 *p) 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 gss_validate: gss_verify_mic returned " - "error 0x%08x\n", task->tk_pid, 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 gss_validate: gss_verify_mic succeeded.\n", - task->tk_pid); + dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n", + task->tk_pid, __func__); return p + XDR_QUADLEN(len); out_bad: gss_put_ctx(ctx); - dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); - return NULL; + dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__, + PTR_ERR(ret)); + 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, - kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) + 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; @@ -1001,9 +1602,7 @@ gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; *p++ = htonl(rqstp->rq_seqno); - status = rpc_call_xdrproc(encode, rqstp, p, obj); - if (status) - return status; + gss_wrap_req_encode(encode, rqstp, p, obj); if (xdr_buf_subsegment(snd_buf, &integ_buf, offset, snd_buf->len - offset)) @@ -1069,16 +1668,16 @@ alloc_enc_pages(struct rpc_rqst *rqstp) rqstp->rq_release_snd_buf = priv_release_snd_buf; return 0; out_free: - for (i--; i >= 0; i--) { - __free_page(rqstp->rq_enc_pages[i]); - } + 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, - kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) + kxdreproc_t encode, struct rpc_rqst *rqstp, + __be32 *p, void *obj) { struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; u32 offset; @@ -1095,9 +1694,7 @@ gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; *p++ = htonl(rqstp->rq_seqno); - status = rpc_call_xdrproc(encode, rqstp, p, obj); - if (status) - return status; + gss_wrap_req_encode(encode, rqstp, p, obj); status = alloc_enc_pages(rqstp); if (status) @@ -1106,15 +1703,21 @@ gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, inpages = snd_buf->pages + first; snd_buf->pages = rqstp->rq_enc_pages; snd_buf->page_base -= first << PAGE_CACHE_SHIFT; - /* Give the tail its own page, in case we need extra space in the - * head when wrapping: */ + /* + * 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); - /* RPC_SLACK_SPACE should prevent this ever happening: */ + /* 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 @@ -1141,38 +1744,38 @@ gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, static int gss_wrap_req(struct rpc_task *task, - kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) + kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) { - struct rpc_cred *cred = task->tk_msg.rpc_cred; + 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 gss_wrap_req\n", task->tk_pid); + 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. */ - status = rpc_call_xdrproc(encode, rqstp, p, obj); + gss_wrap_req_encode(encode, rqstp, p, obj); + status = 0; goto out; } switch (gss_cred->gc_service) { - case RPC_GSS_SVC_NONE: - status = rpc_call_xdrproc(encode, rqstp, p, obj); - 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; + 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 gss_wrap_req returning %d\n", task->tk_pid, status); + dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status); return status; } @@ -1241,12 +1844,21 @@ gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, 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, - kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) + kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) { - struct rpc_cred *cred = task->tk_msg.rpc_cred; + 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); @@ -1258,58 +1870,62 @@ gss_unwrap_resp(struct rpc_task *task, 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; + 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 = rpc_call_xdrproc(decode, rqstp, p, obj); + status = gss_unwrap_req_decode(decode, rqstp, p, obj); out: gss_put_ctx(ctx); - dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, - status); + 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, -#ifdef RPC_DEBUG .au_name = "RPCSEC_GSS", -#endif .create = gss_create, .destroy = gss_destroy, .lookup_cred = gss_lookup_cred, - .crcreate = gss_create_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, }; static const struct rpc_credops gss_nullops = { .cr_name = "AUTH_GSS", - .crdestroy = gss_destroy_cred, + .crdestroy = gss_destroy_nullcred, + .crbind = rpcauth_generic_bind_cred, .crmatch = gss_match, .crmarshal = gss_marshal, .crrefresh = gss_refresh_null, @@ -1318,13 +1934,37 @@ static const struct rpc_credops gss_nullops = { .crunwrap_resp = gss_unwrap_resp, }; -static struct rpc_pipe_ops gss_upcall_ops = { - .upcall = gss_pipe_upcall, +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 */ @@ -1338,7 +1978,13 @@ static int __init init_rpcsec_gss(void) 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: @@ -1347,10 +1993,26 @@ out: 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) |