lustre/sec/sec_null.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Copyright (C) 2004 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of Lustre, http://www.lustre.org.
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #ifndef EXPORT_SYMTAB
  23 # define EXPORT_SYMTAB
  24 #endif
  25 #define DEBUG_SUBSYSTEM S_SEC
  26 #ifdef __KERNEL__
  27 #include <linux/init.h>
  28 #include <linux/module.h>
  29 #include <linux/slab.h>
  30 #else
  31 #include <liblustre.h>
  32 #endif
  33
  34 #include <libcfs/kp30.h>
  35 #include <linux/obd_support.h>
  36 #include <linux/lustre_net.h>
  37 #include <linux/lustre_sec.h>
  38
  39 static int null_cred_refresh(struct ptlrpc_cred *cred)
  40 {
  41         LASSERT(test_bit(PTLRPC_CRED_UPTODATE_BIT, &cred->pc_flags));
  42         return 0;
  43 }
  44
  45 static int null_cred_match(struct ptlrpc_cred *cred,
  46                            struct vfs_cred *vcred)
  47 {
  48         return 1;
  49 }
  50
  51 static int null_cred_sign(struct ptlrpc_cred *cred,
  52                           struct ptlrpc_request *req)
  53 {
  54         struct ptlrpcs_wire_hdr *hdr = buf_to_sec_hdr(req->rq_reqbuf);
  55
  56         hdr->sec_len = cpu_to_le32(0);
  57         return 0;
  58 }
  59
  60 static int null_cred_verify(struct ptlrpc_cred *cred,
  61                             struct ptlrpc_request *req)
  62 {
  63         struct ptlrpcs_wire_hdr *hdr = buf_to_sec_hdr(req->rq_repbuf);
  64
  65         if (hdr->sec_len != 0) {
  66                 CERROR("security payload %u not zero\n", hdr->sec_len);
  67                 return -EPROTO;
  68         }
  69
  70         req->rq_repmsg = (struct lustre_msg *)(hdr + 1);
  71         req->rq_replen = hdr->msg_len;
  72         CDEBUG(D_SEC, "set repmsg at %p, len %d\n",
  73                req->rq_repmsg, req->rq_replen);
  74
  75         return 0;
  76 }
  77
  78 static void null_cred_destroy(struct ptlrpc_cred *cred)
  79 {
  80         LASSERT(!atomic_read(&cred->pc_refcount));
  81
  82         CDEBUG(D_SEC, "NULL_SEC: destroy cred %p\n", cred);
  83         OBD_FREE(cred, sizeof(*cred));
  84 }
  85
  86 static struct ptlrpc_credops null_credops = {
  87         .refresh        = null_cred_refresh,
  88         .match          = null_cred_match,
  89         .sign           = null_cred_sign,
  90         .verify         = null_cred_verify,
  91         .destroy        = null_cred_destroy,
  92 };
  93
  94 static
  95 struct ptlrpc_sec* null_create_sec(ptlrpcs_flavor_t *flavor,
  96                                    const char *pipe_dir,
  97                                    void *pipe_data)
  98 {
  99         struct ptlrpc_sec *sec;
 100         ENTRY;
 101
 102         LASSERT(flavor->flavor == PTLRPC_SEC_NULL);
 103
 104         OBD_ALLOC(sec, sizeof(*sec));
 105         if (!sec)
 106                 RETURN(ERR_PTR(-ENOMEM));
 107
 108         sec->ps_sectype = PTLRPC_SEC_TYPE_NONE;
 109         sec->ps_expire = (-1UL >> 1); /* never expire */
 110         sec->ps_nextgc = (-1UL >> 1);
 111         sec->ps_flags = 0;
 112
 113         CDEBUG(D_SEC, "Create NULL security module at %p\n", sec);
 114         RETURN(sec);
 115 }
 116
 117 static
 118 void null_destroy_sec(struct ptlrpc_sec *sec)
 119 {
 120         ENTRY;
 121
 122         CDEBUG(D_SEC, "Destroy NULL security module at %p\n", sec);
 123
 124         LASSERT(!atomic_read(&sec->ps_refcount));
 125         OBD_FREE(sec, sizeof(*sec));
 126         EXIT;
 127 }
 128
 129 static
 130 struct ptlrpc_cred* null_create_cred(struct ptlrpc_sec *sec,
 131                                      struct vfs_cred *vcred)
 132 {
 133         struct ptlrpc_cred *cred;
 134         ENTRY;
 135
 136         OBD_ALLOC(cred, sizeof(*cred));
 137         if (!cred)
 138                 RETURN(NULL);
 139
 140         INIT_LIST_HEAD(&cred->pc_hash);
 141         atomic_set(&cred->pc_refcount, 0);
 142         cred->pc_sec = sec;
 143         cred->pc_ops = &null_credops;
 144         cred->pc_expire = 0;
 145         cred->pc_flags = PTLRPC_CRED_UPTODATE;
 146         cred->pc_pag = vcred->vc_pag;
 147         cred->pc_uid = vcred->vc_uid;
 148         CDEBUG(D_SEC, "create a null cred at %p("LPU64"/%u)\n",
 149                cred, vcred->vc_pag, vcred->vc_uid);
 150
 151         RETURN(cred);
 152 }
 153
 154 static struct ptlrpc_secops null_secops = {
 155         .create_sec     = null_create_sec,
 156         .destroy_sec    = null_destroy_sec,
 157         .create_cred    = null_create_cred,
 158 };
 159
 160 static struct ptlrpc_sec_type null_type = {
 161         .pst_owner      = THIS_MODULE,
 162         .pst_name       = "NULL_SEC",
 163         .pst_inst       = ATOMIC_INIT(0),
 164         .pst_flavor     = {PTLRPC_SEC_NULL, 0},
 165         .pst_ops        = &null_secops,
 166 };
 167
 168 int ptlrpcs_null_init(void)
 169 {
 170         int rc;
 171
 172         rc = ptlrpcs_register(&null_type);
 173         if (rc)
 174                 CERROR("failed to register NULL security: %d\n", rc);
 175
 176         return rc;
 177 }
 178
 179 int ptlrpcs_null_exit(void)
 180 {
 181         int rc;
 182
 183         rc = ptlrpcs_unregister(&null_type);
 184         if (rc)
 185                 CERROR("cannot unregister NULL security: %d\n", rc);
 186
 187         return rc;
 188 }