From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- net/sunrpc/auth_gss/gss_rpc_upcall.c | 384 +++++++++++++++++++++++++++++++++++ 1 file changed, 384 insertions(+) create mode 100644 net/sunrpc/auth_gss/gss_rpc_upcall.c (limited to 'net/sunrpc/auth_gss/gss_rpc_upcall.c') diff --git a/net/sunrpc/auth_gss/gss_rpc_upcall.c b/net/sunrpc/auth_gss/gss_rpc_upcall.c new file mode 100644 index 000000000..59eeed43e --- /dev/null +++ b/net/sunrpc/auth_gss/gss_rpc_upcall.c @@ -0,0 +1,384 @@ +/* + * linux/net/sunrpc/gss_rpc_upcall.c + * + * Copyright (C) 2012 Simo Sorce + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include +#include + +#include +#include "gss_rpc_upcall.h" + +#define GSSPROXY_SOCK_PATHNAME "/var/run/gssproxy.sock" + +#define GSSPROXY_PROGRAM (400112u) +#define GSSPROXY_VERS_1 (1u) + +/* + * Encoding/Decoding functions + */ + +enum { + GSSX_NULL = 0, /* Unused */ + GSSX_INDICATE_MECHS = 1, + GSSX_GET_CALL_CONTEXT = 2, + GSSX_IMPORT_AND_CANON_NAME = 3, + GSSX_EXPORT_CRED = 4, + GSSX_IMPORT_CRED = 5, + GSSX_ACQUIRE_CRED = 6, + GSSX_STORE_CRED = 7, + GSSX_INIT_SEC_CONTEXT = 8, + GSSX_ACCEPT_SEC_CONTEXT = 9, + GSSX_RELEASE_HANDLE = 10, + GSSX_GET_MIC = 11, + GSSX_VERIFY = 12, + GSSX_WRAP = 13, + GSSX_UNWRAP = 14, + GSSX_WRAP_SIZE_LIMIT = 15, +}; + +#define PROC(proc, name) \ +[GSSX_##proc] = { \ + .p_proc = GSSX_##proc, \ + .p_encode = (kxdreproc_t)gssx_enc_##name, \ + .p_decode = (kxdrdproc_t)gssx_dec_##name, \ + .p_arglen = GSSX_ARG_##name##_sz, \ + .p_replen = GSSX_RES_##name##_sz, \ + .p_statidx = GSSX_##proc, \ + .p_name = #proc, \ +} + +static struct rpc_procinfo gssp_procedures[] = { + PROC(INDICATE_MECHS, indicate_mechs), + PROC(GET_CALL_CONTEXT, get_call_context), + PROC(IMPORT_AND_CANON_NAME, import_and_canon_name), + PROC(EXPORT_CRED, export_cred), + PROC(IMPORT_CRED, import_cred), + PROC(ACQUIRE_CRED, acquire_cred), + PROC(STORE_CRED, store_cred), + PROC(INIT_SEC_CONTEXT, init_sec_context), + PROC(ACCEPT_SEC_CONTEXT, accept_sec_context), + PROC(RELEASE_HANDLE, release_handle), + PROC(GET_MIC, get_mic), + PROC(VERIFY, verify), + PROC(WRAP, wrap), + PROC(UNWRAP, unwrap), + PROC(WRAP_SIZE_LIMIT, wrap_size_limit), +}; + + + +/* + * Common transport functions + */ + +static const struct rpc_program gssp_program; + +static int gssp_rpc_create(struct net *net, struct rpc_clnt **_clnt) +{ + static const struct sockaddr_un gssp_localaddr = { + .sun_family = AF_LOCAL, + .sun_path = GSSPROXY_SOCK_PATHNAME, + }; + struct rpc_create_args args = { + .net = net, + .protocol = XPRT_TRANSPORT_LOCAL, + .address = (struct sockaddr *)&gssp_localaddr, + .addrsize = sizeof(gssp_localaddr), + .servername = "localhost", + .program = &gssp_program, + .version = GSSPROXY_VERS_1, + .authflavor = RPC_AUTH_NULL, + /* + * Note we want connection to be done in the caller's + * filesystem namespace. We therefore turn off the idle + * timeout, which would result in reconnections being + * done without the correct namespace: + */ + .flags = RPC_CLNT_CREATE_NOPING | + RPC_CLNT_CREATE_NO_IDLE_TIMEOUT + }; + struct rpc_clnt *clnt; + int result = 0; + + clnt = rpc_create(&args); + if (IS_ERR(clnt)) { + dprintk("RPC: failed to create AF_LOCAL gssproxy " + "client (errno %ld).\n", PTR_ERR(clnt)); + result = PTR_ERR(clnt); + *_clnt = NULL; + goto out; + } + + dprintk("RPC: created new gssp local client (gssp_local_clnt: " + "%p)\n", clnt); + *_clnt = clnt; + +out: + return result; +} + +void init_gssp_clnt(struct sunrpc_net *sn) +{ + mutex_init(&sn->gssp_lock); + sn->gssp_clnt = NULL; +} + +int set_gssp_clnt(struct net *net) +{ + struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); + struct rpc_clnt *clnt; + int ret; + + mutex_lock(&sn->gssp_lock); + ret = gssp_rpc_create(net, &clnt); + if (!ret) { + if (sn->gssp_clnt) + rpc_shutdown_client(sn->gssp_clnt); + sn->gssp_clnt = clnt; + } + mutex_unlock(&sn->gssp_lock); + return ret; +} + +void clear_gssp_clnt(struct sunrpc_net *sn) +{ + mutex_lock(&sn->gssp_lock); + if (sn->gssp_clnt) { + rpc_shutdown_client(sn->gssp_clnt); + sn->gssp_clnt = NULL; + } + mutex_unlock(&sn->gssp_lock); +} + +static struct rpc_clnt *get_gssp_clnt(struct sunrpc_net *sn) +{ + struct rpc_clnt *clnt; + + mutex_lock(&sn->gssp_lock); + clnt = sn->gssp_clnt; + if (clnt) + atomic_inc(&clnt->cl_count); + mutex_unlock(&sn->gssp_lock); + return clnt; +} + +static int gssp_call(struct net *net, struct rpc_message *msg) +{ + struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); + struct rpc_clnt *clnt; + int status; + + clnt = get_gssp_clnt(sn); + if (!clnt) + return -EIO; + status = rpc_call_sync(clnt, msg, 0); + if (status < 0) { + dprintk("gssp: rpc_call returned error %d\n", -status); + switch (status) { + case -EPROTONOSUPPORT: + status = -EINVAL; + break; + case -ECONNREFUSED: + case -ETIMEDOUT: + case -ENOTCONN: + status = -EAGAIN; + break; + case -ERESTARTSYS: + if (signalled ()) + status = -EINTR; + break; + default: + break; + } + } + rpc_release_client(clnt); + return status; +} + +static void gssp_free_receive_pages(struct gssx_arg_accept_sec_context *arg) +{ + int i; + + for (i = 0; i < arg->npages && arg->pages[i]; i++) + __free_page(arg->pages[i]); + + kfree(arg->pages); +} + +static int gssp_alloc_receive_pages(struct gssx_arg_accept_sec_context *arg) +{ + arg->npages = DIV_ROUND_UP(NGROUPS_MAX * 4, PAGE_SIZE); + arg->pages = kzalloc(arg->npages * sizeof(struct page *), GFP_KERNEL); + /* + * XXX: actual pages are allocated by xdr layer in + * xdr_partial_copy_from_skb. + */ + if (!arg->pages) + return -ENOMEM; + return 0; +} + +/* + * Public functions + */ + +/* numbers somewhat arbitrary but large enough for current needs */ +#define GSSX_MAX_OUT_HANDLE 128 +#define GSSX_MAX_SRC_PRINC 256 +#define GSSX_KMEMBUF (GSSX_max_output_handle_sz + \ + GSSX_max_oid_sz + \ + GSSX_max_princ_sz + \ + sizeof(struct svc_cred)) + +int gssp_accept_sec_context_upcall(struct net *net, + struct gssp_upcall_data *data) +{ + struct gssx_ctx ctxh = { + .state = data->in_handle + }; + struct gssx_arg_accept_sec_context arg = { + .input_token = data->in_token, + }; + struct gssx_ctx rctxh = { + /* + * pass in the max length we expect for each of these + * buffers but let the xdr code kmalloc them: + */ + .exported_context_token.len = GSSX_max_output_handle_sz, + .mech.len = GSS_OID_MAX_LEN, + .src_name.display_name.len = GSSX_max_princ_sz + }; + struct gssx_res_accept_sec_context res = { + .context_handle = &rctxh, + .output_token = &data->out_token + }; + struct rpc_message msg = { + .rpc_proc = &gssp_procedures[GSSX_ACCEPT_SEC_CONTEXT], + .rpc_argp = &arg, + .rpc_resp = &res, + .rpc_cred = NULL, /* FIXME ? */ + }; + struct xdr_netobj client_name = { 0 , NULL }; + int ret; + + if (data->in_handle.len != 0) + arg.context_handle = &ctxh; + res.output_token->len = GSSX_max_output_token_sz; + + ret = gssp_alloc_receive_pages(&arg); + if (ret) + return ret; + + /* use nfs/ for targ_name ? */ + + ret = gssp_call(net, &msg); + + gssp_free_receive_pages(&arg); + + /* we need to fetch all data even in case of error so + * that we can free special strctures is they have been allocated */ + data->major_status = res.status.major_status; + data->minor_status = res.status.minor_status; + if (res.context_handle) { + data->out_handle = rctxh.exported_context_token; + data->mech_oid.len = rctxh.mech.len; + if (rctxh.mech.data) + memcpy(data->mech_oid.data, rctxh.mech.data, + data->mech_oid.len); + client_name = rctxh.src_name.display_name; + } + + if (res.options.count == 1) { + gssx_buffer *value = &res.options.data[0].value; + /* Currently we only decode CREDS_VALUE, if we add + * anything else we'll have to loop and match on the + * option name */ + if (value->len == 1) { + /* steal group info from struct svc_cred */ + data->creds = *(struct svc_cred *)value->data; + data->found_creds = 1; + } + /* whether we use it or not, free data */ + kfree(value->data); + } + + if (res.options.count != 0) { + kfree(res.options.data); + } + + /* convert to GSS_NT_HOSTBASED_SERVICE form and set into creds */ + if (data->found_creds && client_name.data != NULL) { + char *c; + + data->creds.cr_principal = kstrndup(client_name.data, + client_name.len, GFP_KERNEL); + if (data->creds.cr_principal) { + /* terminate and remove realm part */ + c = strchr(data->creds.cr_principal, '@'); + if (c) { + *c = '\0'; + + /* change service-hostname delimiter */ + c = strchr(data->creds.cr_principal, '/'); + if (c) *c = '@'; + } + if (!c) { + /* not a service principal */ + kfree(data->creds.cr_principal); + data->creds.cr_principal = NULL; + } + } + } + kfree(client_name.data); + + return ret; +} + +void gssp_free_upcall_data(struct gssp_upcall_data *data) +{ + kfree(data->in_handle.data); + kfree(data->out_handle.data); + kfree(data->out_token.data); + free_svc_cred(&data->creds); +} + +/* + * Initialization stuff + */ + +static const struct rpc_version gssp_version1 = { + .number = GSSPROXY_VERS_1, + .nrprocs = ARRAY_SIZE(gssp_procedures), + .procs = gssp_procedures, +}; + +static const struct rpc_version *gssp_version[] = { + NULL, + &gssp_version1, +}; + +static struct rpc_stat gssp_stats; + +static const struct rpc_program gssp_program = { + .name = "gssproxy", + .number = GSSPROXY_PROGRAM, + .nrvers = ARRAY_SIZE(gssp_version), + .version = gssp_version, + .stats = &gssp_stats, +}; -- cgit v1.2.3-54-g00ecf