1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2006 Cluster File Systems, Inc.
5 * Author: Eric Mei <ericm@clusterfs.com>
7 * This file is part of the Lustre file system, http://www.lustre.org
8 * Lustre is a trademark of Cluster File Systems, Inc.
10 * You may have signed or agreed to another license before downloading
11 * this software. If so, you are bound by the terms and conditions
12 * of that agreement, and the following does not apply to you. See the
13 * LICENSE file included with this distribution for more information.
15 * If you did not agree to a different license, then this copy of Lustre
16 * is open source software; you can redistribute it and/or modify it
17 * under the terms of version 2 of the GNU General Public License as
18 * published by the Free Software Foundation.
20 * In either case, Lustre is distributed in the hope that it will be
21 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
22 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * license text for more details.
28 # define EXPORT_SYMTAB
30 #define DEBUG_SUBSYSTEM S_SEC
32 #include <linux/init.h>
33 #include <linux/module.h>
34 #include <linux/slab.h>
35 #include <linux/dcache.h>
37 #include <linux/mutex.h>
38 #include <linux/random.h>
40 #include <liblustre.h>
44 #include <obd_class.h>
45 #include <obd_support.h>
46 #include <lustre/lustre_idl.h>
47 #include <lustre_net.h>
48 #include <lustre_import.h>
49 #include <lustre_sec.h>
52 #include "gss_internal.h"
55 /**********************************************
56 * gss context init/fini helper *
57 **********************************************/
60 int ctx_init_pack_request(struct obd_import *imp,
61 struct ptlrpc_request *req,
67 struct lustre_msg *msg = req->rq_reqbuf;
69 struct gss_header *ghdr;
70 struct ptlrpc_user_desc *pud;
71 __u32 *p, size, offset = 2;
74 LASSERT(msg->lm_bufcount <= 4);
75 LASSERT(req->rq_cli_ctx);
76 LASSERT(req->rq_cli_ctx->cc_sec);
79 ghdr = lustre_msg_buf(msg, 0, sizeof(*ghdr));
80 ghdr->gh_version = PTLRPC_GSS_VERSION;
82 ghdr->gh_proc = PTLRPC_GSS_PROC_INIT;
84 ghdr->gh_svc = SPTLRPC_SVC_NULL;
85 ghdr->gh_handle.len = 0;
87 /* fix the user desc */
88 if (req->rq_pack_udesc) {
89 ghdr->gh_flags |= LUSTRE_GSS_PACK_USER;
91 pud = lustre_msg_buf(msg, offset, sizeof(*pud));
93 pud->pud_uid = pud->pud_fsuid = uid;
94 pud->pud_gid = pud->pud_fsgid = gid;
100 /* security payload */
101 p = lustre_msg_buf(msg, offset, 0);
102 size = msg->lm_buflens[offset];
105 /* 1. lustre svc type */
107 *p++ = cpu_to_le32(lustre_srv);
111 obj.len = strlen(imp->imp_obd->u.cli.cl_target_uuid.uuid) + 1;
112 obj.data = imp->imp_obd->u.cli.cl_target_uuid.uuid;
113 if (rawobj_serialize(&obj, &p, &size))
116 /* 3. reverse context handle. actually only needed by root user,
117 * but we send it anyway. */
118 gsec = sec2gsec(req->rq_cli_ctx->cc_sec);
119 obj.len = sizeof(gsec->gs_rvs_hdl);
120 obj.data = (__u8 *) &gsec->gs_rvs_hdl;
121 if (rawobj_serialize(&obj, &p, &size))
124 /* 4. now the token */
125 LASSERT(size >= (sizeof(__u32) + token_size));
126 *p++ = cpu_to_le32(((__u32) token_size));
127 if (copy_from_user(p, token, token_size)) {
128 CERROR("can't copy token\n");
131 size -= sizeof(__u32) + size_round4(token_size);
133 req->rq_reqdata_len = lustre_shrink_msg(req->rq_reqbuf, offset,
134 msg->lm_buflens[offset] - size, 0);
139 int ctx_init_parse_reply(struct lustre_msg *msg,
140 char __user *outbuf, long outlen)
142 struct gss_rep_header *ghdr;
143 __u32 obj_len, round_len;
144 __u32 status, effective = 0;
146 if (msg->lm_bufcount != 3) {
147 CERROR("unexpected bufcount %u\n", msg->lm_bufcount);
151 ghdr = (struct gss_rep_header *) gss_swab_header(msg, 0);
153 CERROR("unable to extract gss reply header\n");
157 if (ghdr->gh_version != PTLRPC_GSS_VERSION) {
158 CERROR("invalid gss version %u\n", ghdr->gh_version);
162 if (outlen < (4 + 2) * 4 + size_round4(ghdr->gh_handle.len) +
163 size_round4(msg->lm_buflens[2])) {
164 CERROR("output buffer size %ld too small\n", outlen);
171 if (copy_to_user(outbuf, &status, 4))
174 if (copy_to_user(outbuf, &ghdr->gh_major, 4))
177 if (copy_to_user(outbuf, &ghdr->gh_minor, 4))
180 if (copy_to_user(outbuf, &ghdr->gh_seqwin, 4))
186 obj_len = ghdr->gh_handle.len;
187 round_len = (obj_len + 3) & ~ 3;
188 if (copy_to_user(outbuf, &obj_len, 4))
191 if (copy_to_user(outbuf, (char *) ghdr->gh_handle.data, round_len))
194 effective += 4 + round_len;
197 obj_len = msg->lm_buflens[2];
198 round_len = (obj_len + 3) & ~ 3;
199 if (copy_to_user(outbuf, &obj_len, 4))
202 if (copy_to_user(outbuf, lustre_msg_buf(msg, 2, 0), round_len))
205 effective += 4 + round_len;
210 /* XXX move to where lgssd could see */
211 struct lgssd_ioctl_param {
212 int version; /* in */
215 int lustre_svc; /* in */
218 long send_token_size;/* in */
219 char *send_token; /* in */
220 long reply_buf_size; /* in */
221 char *reply_buf; /* in */
222 long status; /* out */
223 long reply_length; /* out */
226 int gss_do_ctx_init_rpc(__user char *buffer, unsigned long count)
228 struct obd_import *imp;
229 struct ptlrpc_request *req;
230 struct lgssd_ioctl_param param;
231 struct obd_device *obd;
236 if (count != sizeof(param)) {
237 CERROR("ioctl size %lu, expect %lu, please check lgssd version\n",
238 count, (unsigned long) sizeof(param));
241 if (copy_from_user(¶m, buffer, sizeof(param))) {
242 CERROR("failed copy data from lgssd\n");
246 if (param.version != GSSD_INTERFACE_VERSION) {
247 CERROR("gssd interface version %d (expect %d)\n",
248 param.version, GSSD_INTERFACE_VERSION);
253 if (strncpy_from_user(obdname, param.uuid, sizeof(obdname)) <= 0) {
254 CERROR("Invalid obdname pointer\n");
258 obd = class_name2obd(obdname);
260 CERROR("no such obd %s\n", obdname);
264 imp = class_import_get(obd->u.cli.cl_import);
265 LASSERT(imp->imp_sec);
267 /* force this import to use v2 msg */
268 imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
270 req = ptlrpc_request_alloc_pack(imp, &RQF_SEC_CTX, LUSTRE_OBD_VERSION,
273 param.status = -ENOMEM;
277 if (req->rq_cli_ctx->cc_sec->ps_id != param.secid) {
278 CWARN("original secid %d, now has changed to %d, "
279 "cancel this negotiation\n", param.secid,
280 req->rq_cli_ctx->cc_sec->ps_id);
281 param.status = -EINVAL;
286 rc = ctx_init_pack_request(imp, req,
288 param.uid, param.gid,
289 param.send_token_size,
296 ptlrpc_request_set_replen(req);
298 rc = ptlrpc_queue_wait(req);
300 /* If any _real_ denial be made, we expect server return
301 * -EACCES reply or return success but indicate gss error
302 * inside reply messsage. All other errors are treated as
303 * timeout, caller might try the negotiation repeatedly,
304 * leave recovery decisions to general ptlrpc layer.
306 * FIXME maybe some other error code shouldn't be treated
310 param.status = -ETIMEDOUT;
314 lsize = ctx_init_parse_reply(req->rq_repbuf,
315 param.reply_buf, param.reply_buf_size);
317 param.status = (int) lsize;
322 param.reply_length = lsize;
325 if (copy_to_user(buffer, ¶m, sizeof(param)))
330 class_import_put(imp);
331 ptlrpc_req_finished(req);
335 int gss_do_ctx_fini_rpc(struct gss_cli_ctx *gctx)
337 struct ptlrpc_cli_ctx *ctx = &gctx->gc_base;
338 struct obd_import *imp = ctx->cc_sec->ps_import;
339 struct ptlrpc_request *req;
340 struct ptlrpc_user_desc *pud;
344 LASSERT(atomic_read(&ctx->cc_refcount) > 0);
346 if (cli_ctx_is_error(ctx) || !cli_ctx_is_uptodate(ctx)) {
347 CDEBUG(D_SEC, "ctx %p(%u->%s) not uptodate, "
348 "don't send destroy rpc\n", ctx,
349 ctx->cc_vcred.vc_uid, sec2target_str(ctx->cc_sec));
355 CWARN("%s ctx %p idx "LPX64" (%u->%s)\n",
356 sec_is_reverse(ctx->cc_sec) ?
357 "server finishing reverse" : "client finishing forward",
358 ctx, gss_handle_to_u64(&gctx->gc_handle),
359 ctx->cc_vcred.vc_uid, sec2target_str(ctx->cc_sec));
361 gctx->gc_proc = PTLRPC_GSS_PROC_DESTROY;
363 req = ptlrpc_request_alloc(imp, &RQF_SEC_CTX);
365 CWARN("ctx %p(%u): fail to prepare rpc, destroy locally\n",
366 ctx, ctx->cc_vcred.vc_uid);
367 GOTO(out, rc = -ENOMEM);
370 rc = ptlrpc_request_bufs_pack(req, LUSTRE_OBD_VERSION, SEC_CTX_FINI,
373 ptlrpc_request_free(req);
377 /* fix the user desc */
378 if (req->rq_pack_udesc) {
379 /* we rely the fact that this request is in AUTH mode,
380 * and user_desc at offset 2. */
381 pud = lustre_msg_buf(req->rq_reqbuf, 2, sizeof(*pud));
383 pud->pud_uid = pud->pud_fsuid = ctx->cc_vcred.vc_uid;
384 pud->pud_gid = pud->pud_fsgid = ctx->cc_vcred.vc_gid;
386 pud->pud_ngroups = 0;
389 req->rq_phase = RQ_PHASE_RPC;
390 rc = ptl_send_rpc(req, 1);
392 CWARN("ctx %p(%u->%s): rpc error %d, destroy locally\n", ctx,
393 ctx->cc_vcred.vc_uid, sec2target_str(ctx->cc_sec), rc);
396 ptlrpc_req_finished(req);
401 int __init gss_init_cli_upcall(void)
406 void __exit gss_exit_cli_upcall(void)