source4/ntvfs/posix/pvfs_acl_nfs4.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    POSIX NTVFS backend - NT ACLs mapped to NFS4 ACLs, as per
   5    http://www.suse.de/~agruen/nfs4acl/
   6
   7    Copyright (C) Andrew Tridgell 2006
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "vfs_posix.h"
  25 #include "../lib/util/unix_privs.h"
  26 #include "librpc/gen_ndr/ndr_nfs4acl.h"
  27 #include "libcli/security/security.h"
  28
  29 #define ACE4_IDENTIFIER_GROUP 0x40
  30
  31 /*
  32   load the current ACL from system.nfs4acl
  33 */
  34 static NTSTATUS pvfs_acl_load_nfs4(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
  35                                    TALLOC_CTX *mem_ctx,
  36                                    struct security_descriptor **psd)
  37 {
  38         NTSTATUS status;
  39         struct nfs4acl *acl;
  40         struct security_descriptor *sd;
  41         int i, num_ids;
  42         struct id_map *ids;
  43         struct composite_context *ctx;
  44
  45         acl = talloc_zero(mem_ctx, struct nfs4acl);
  46         NT_STATUS_HAVE_NO_MEMORY(acl);
  47
  48         status = pvfs_xattr_ndr_load(pvfs, mem_ctx, name->full_name, fd,
  49                                      NFS4ACL_XATTR_NAME,
  50                                      acl, ndr_pull_nfs4acl);
  51         if (!NT_STATUS_IS_OK(status)) {
  52                 talloc_free(acl);
  53                 return status;
  54         }
  55
  56         *psd = security_descriptor_initialise(mem_ctx);
  57         NT_STATUS_HAVE_NO_MEMORY(*psd);
  58
  59         sd = *psd;
  60
  61         sd->type |= acl->a_flags;
  62
  63         /* the number of ids to map is the acl count plus uid and gid */
  64         num_ids = acl->a_count +2;
  65         ids = talloc_array(sd, struct id_map, num_ids);
  66         NT_STATUS_HAVE_NO_MEMORY(ids);
  67
  68         ids[0].xid.id = name->st.st_uid;
  69         ids[0].xid.type = ID_TYPE_UID;
  70         ids[0].sid = NULL;
  71         ids[0].status = ID_UNKNOWN;
  72
  73         ids[1].xid.id = name->st.st_gid;
  74         ids[1].xid.type = ID_TYPE_GID;
  75         ids[1].sid = NULL;
  76         ids[1].status = ID_UNKNOWN;
  77
  78         for (i=0;i<acl->a_count;i++) {
  79                 struct nfs4ace *a = &acl->ace[i];
  80                 ids[i+2].xid.id = a->e_id;
  81                 if (a->e_flags & ACE4_IDENTIFIER_GROUP) {
  82                         ids[i+2].xid.type = ID_TYPE_GID;
  83                 } else {
  84                         ids[i+2].xid.type = ID_TYPE_UID;
  85                 }
  86                 ids[i+2].sid = NULL;
  87                 ids[i+2].status = ID_UNKNOWN;
  88         }
  89
  90         /* Allocate memory for the sids from the security descriptor to be on
  91          * the safe side. */
  92         ctx = wbc_xids_to_sids_send(pvfs->wbc_ctx, sd, num_ids, ids);
  93         NT_STATUS_HAVE_NO_MEMORY(ctx);
  94         status = wbc_xids_to_sids_recv(ctx, &ids);
  95         NT_STATUS_NOT_OK_RETURN(status);
  96
  97         sd->owner_sid = talloc_steal(sd, ids[0].sid);
  98         sd->group_sid = talloc_steal(sd, ids[1].sid);
  99
 100         for (i=0;i<acl->a_count;i++) {
 101                 struct nfs4ace *a = &acl->ace[i];
 102                 struct security_ace ace;
 103                 ace.type = a->e_type;
 104                 ace.flags = a->e_flags;
 105                 ace.access_mask = a->e_mask;
 106                 ace.trustee = *ids[i+2].sid;
 107                 security_descriptor_dacl_add(sd, &ace);
 108         }
 109
 110         return NT_STATUS_OK;
 111 }
 112
 113 /*
 114   save the acl for a file into system.nfs4acl
 115 */
 116 static NTSTATUS pvfs_acl_save_nfs4(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
 117                                    struct security_descriptor *sd)
 118 {
 119         NTSTATUS status;
 120         void *privs;
 121         struct nfs4acl acl;
 122         int i;
 123         TALLOC_CTX *tmp_ctx;
 124         struct id_map *ids;
 125         struct composite_context *ctx;
 126
 127         tmp_ctx = talloc_new(pvfs);
 128         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
 129
 130         acl.a_version = 0;
 131         acl.a_flags   = sd->type;
 132         acl.a_count   = sd->dacl?sd->dacl->num_aces:0;
 133         acl.a_owner_mask = 0;
 134         acl.a_group_mask = 0;
 135         acl.a_other_mask = 0;
 136
 137         acl.ace = talloc_array(tmp_ctx, struct nfs4ace, acl.a_count);
 138         if (!acl.ace) {
 139                 talloc_free(tmp_ctx);
 140                 return NT_STATUS_NO_MEMORY;
 141         }
 142
 143         ids = talloc_array(tmp_ctx, struct id_map, acl.a_count);
 144         if (ids == NULL) {
 145                 talloc_free(tmp_ctx);
 146                 return NT_STATUS_NO_MEMORY;
 147         }
 148
 149         for (i=0;i<acl.a_count;i++) {
 150                 struct security_ace *ace = &sd->dacl->aces[i];
 151                 ZERO_STRUCT(ids[i].xid);
 152                 ids[i].sid = dom_sid_dup(ids, &ace->trustee);
 153                 if (ids[i].sid == NULL) {
 154                         talloc_free(tmp_ctx);
 155                         return NT_STATUS_NO_MEMORY;
 156                 }
 157                 ids[i].status = ID_UNKNOWN;
 158         }
 159
 160         ctx = wbc_sids_to_xids_send(pvfs->wbc_ctx,ids, acl.a_count, ids);
 161         if (ctx == NULL) {
 162                 talloc_free(tmp_ctx);
 163                 return NT_STATUS_NO_MEMORY;
 164         }
 165         status = wbc_sids_to_xids_recv(ctx, &ids);
 166         if (!NT_STATUS_IS_OK(status)) {
 167                 talloc_free(tmp_ctx);
 168                 return status;
 169         }
 170
 171         for (i=0;i<acl.a_count;i++) {
 172                 struct nfs4ace *a = &acl.ace[i];
 173                 struct security_ace *ace = &sd->dacl->aces[i];
 174                 a->e_type  = ace->type;
 175                 a->e_flags = ace->flags;
 176                 a->e_mask  = ace->access_mask;
 177                 if (ids[i].xid.type != ID_TYPE_UID) {
 178                         a->e_flags |= ACE4_IDENTIFIER_GROUP;
 179                 }
 180                 a->e_id = ids[i].xid.id;
 181                 a->e_who   = "";
 182         }
 183
 184         privs = root_privileges();
 185         status = pvfs_xattr_ndr_save(pvfs, name->full_name, fd,
 186                                      NFS4ACL_XATTR_NAME,
 187                                      &acl, ndr_push_nfs4acl);
 188         talloc_free(privs);
 189
 190         talloc_free(tmp_ctx);
 191         return status;
 192 }
 193
 194
 195 /*
 196   initialise pvfs acl NFS4 backend
 197 */
 198 NTSTATUS pvfs_acl_nfs4_init(void)
 199 {
 200         struct pvfs_acl_ops ops = {
 201                 .name = "nfs4acl",
 202                 .acl_load = pvfs_acl_load_nfs4,
 203                 .acl_save = pvfs_acl_save_nfs4
 204         };
 205         return pvfs_acl_register(&ops);
 206 }