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 NTSTATUS pvfs_acl_nfs4_init(void);
  30
  31 #define ACE4_IDENTIFIER_GROUP 0x40
  32
  33 /*
  34   load the current ACL from system.nfs4acl
  35 */
  36 static NTSTATUS pvfs_acl_load_nfs4(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
  37                                    TALLOC_CTX *mem_ctx,
  38                                    struct security_descriptor **psd)
  39 {
  40         NTSTATUS status;
  41         struct nfs4acl *acl;
  42         struct security_descriptor *sd;
  43         int i, num_ids;
  44         struct id_map *ids;
  45         struct composite_context *ctx;
  46
  47         acl = talloc_zero(mem_ctx, struct nfs4acl);
  48         NT_STATUS_HAVE_NO_MEMORY(acl);
  49
  50         status = pvfs_xattr_ndr_load(pvfs, mem_ctx, name->full_name, fd,
  51                                      NFS4ACL_XATTR_NAME,
  52                                      acl, (void *) ndr_pull_nfs4acl);
  53         if (!NT_STATUS_IS_OK(status)) {
  54                 talloc_free(acl);
  55                 return status;
  56         }
  57
  58         *psd = security_descriptor_initialise(mem_ctx);
  59         NT_STATUS_HAVE_NO_MEMORY(*psd);
  60
  61         sd = *psd;
  62
  63         sd->type |= acl->a_flags;
  64
  65         /* the number of ids to map is the acl count plus uid and gid */
  66         num_ids = acl->a_count +2;
  67         ids = talloc_array(sd, struct id_map, num_ids);
  68         NT_STATUS_HAVE_NO_MEMORY(ids);
  69
  70         ids[0].xid.id = name->st.st_uid;
  71         ids[0].xid.type = ID_TYPE_UID;
  72         ids[0].sid = NULL;
  73         ids[0].status = ID_UNKNOWN;
  74
  75         ids[1].xid.id = name->st.st_gid;
  76         ids[1].xid.type = ID_TYPE_GID;
  77         ids[1].sid = NULL;
  78         ids[1].status = ID_UNKNOWN;
  79
  80         for (i=0;i<acl->a_count;i++) {
  81                 struct nfs4ace *a = &acl->ace[i];
  82                 ids[i+2].xid.id = a->e_id;
  83                 if (a->e_flags & ACE4_IDENTIFIER_GROUP) {
  84                         ids[i+2].xid.type = ID_TYPE_GID;
  85                 } else {
  86                         ids[i+2].xid.type = ID_TYPE_UID;
  87                 }
  88                 ids[i+2].sid = NULL;
  89                 ids[i+2].status = ID_UNKNOWN;
  90         }
  91
  92         /* Allocate memory for the sids from the security descriptor to be on
  93          * the safe side. */
  94         ctx = wbc_xids_to_sids_send(pvfs->wbc_ctx, sd, num_ids, ids);
  95         NT_STATUS_HAVE_NO_MEMORY(ctx);
  96         status = wbc_xids_to_sids_recv(ctx, &ids);
  97         NT_STATUS_NOT_OK_RETURN(status);
  98
  99         sd->owner_sid = talloc_steal(sd, ids[0].sid);
 100         sd->group_sid = talloc_steal(sd, ids[1].sid);
 101
 102         for (i=0;i<acl->a_count;i++) {
 103                 struct nfs4ace *a = &acl->ace[i];
 104                 struct security_ace ace;
 105                 ace.type = a->e_type;
 106                 ace.flags = a->e_flags;
 107                 ace.access_mask = a->e_mask;
 108                 ace.trustee = *ids[i+2].sid;
 109                 security_descriptor_dacl_add(sd, &ace);
 110         }
 111
 112         return NT_STATUS_OK;
 113 }
 114
 115 /*
 116   save the acl for a file into system.nfs4acl
 117 */
 118 static NTSTATUS pvfs_acl_save_nfs4(struct pvfs_state *pvfs, struct pvfs_filename *name, int fd,
 119                                    struct security_descriptor *sd)
 120 {
 121         NTSTATUS status;
 122         void *privs;
 123         struct nfs4acl acl;
 124         int i;
 125         TALLOC_CTX *tmp_ctx;
 126         struct id_map *ids;
 127         struct composite_context *ctx;
 128
 129         tmp_ctx = talloc_new(pvfs);
 130         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
 131
 132         acl.a_version = 0;
 133         acl.a_flags   = sd->type;
 134         acl.a_count   = sd->dacl?sd->dacl->num_aces:0;
 135         acl.a_owner_mask = 0;
 136         acl.a_group_mask = 0;
 137         acl.a_other_mask = 0;
 138
 139         acl.ace = talloc_array(tmp_ctx, struct nfs4ace, acl.a_count);
 140         if (!acl.ace) {
 141                 talloc_free(tmp_ctx);
 142                 return NT_STATUS_NO_MEMORY;
 143         }
 144
 145         ids = talloc_array(tmp_ctx, struct id_map, acl.a_count);
 146         if (ids == NULL) {
 147                 talloc_free(tmp_ctx);
 148                 return NT_STATUS_NO_MEMORY;
 149         }
 150
 151         for (i=0;i<acl.a_count;i++) {
 152                 struct security_ace *ace = &sd->dacl->aces[i];
 153                 ZERO_STRUCT(ids[i].xid);
 154                 ids[i].sid = dom_sid_dup(ids, &ace->trustee);
 155                 if (ids[i].sid == NULL) {
 156                         talloc_free(tmp_ctx);
 157                         return NT_STATUS_NO_MEMORY;
 158                 }
 159                 ids[i].status = ID_UNKNOWN;
 160         }
 161
 162         ctx = wbc_sids_to_xids_send(pvfs->wbc_ctx,ids, acl.a_count, ids);
 163         if (ctx == NULL) {
 164                 talloc_free(tmp_ctx);
 165                 return NT_STATUS_NO_MEMORY;
 166         }
 167         status = wbc_sids_to_xids_recv(ctx, &ids);
 168         if (!NT_STATUS_IS_OK(status)) {
 169                 talloc_free(tmp_ctx);
 170                 return status;
 171         }
 172
 173         for (i=0;i<acl.a_count;i++) {
 174                 struct nfs4ace *a = &acl.ace[i];
 175                 struct security_ace *ace = &sd->dacl->aces[i];
 176                 a->e_type  = ace->type;
 177                 a->e_flags = ace->flags;
 178                 a->e_mask  = ace->access_mask;
 179                 if (ids[i].xid.type != ID_TYPE_UID) {
 180                         a->e_flags |= ACE4_IDENTIFIER_GROUP;
 181                 }
 182                 a->e_id = ids[i].xid.id;
 183                 a->e_who   = "";
 184         }
 185
 186         privs = root_privileges();
 187         status = pvfs_xattr_ndr_save(pvfs, name->full_name, fd,
 188                                      NFS4ACL_XATTR_NAME,
 189                                      &acl, (void *) ndr_push_nfs4acl);
 190         talloc_free(privs);
 191
 192         talloc_free(tmp_ctx);
 193         return status;
 194 }
 195
 196
 197 /*
 198   initialise pvfs acl NFS4 backend
 199 */
 200 NTSTATUS pvfs_acl_nfs4_init(void)
 201 {
 202         struct pvfs_acl_ops ops = {
 203                 .name = "nfs4acl",
 204                 .acl_load = pvfs_acl_load_nfs4,
 205                 .acl_save = pvfs_acl_save_nfs4
 206         };
 207         return pvfs_acl_register(&ops);
 208 }