source3/modules/vfs_aixacl_util.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    VFS module to get and set posix acls
   4    Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2006
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "system/filesys.h"
  22 #include "smbd/smbd.h"
  23 #include "vfs_aixacl_util.h"
  24
  25 SMB_ACL_T aixacl_to_smbacl(struct acl *file_acl)
  26 {
  27         struct acl_entry *acl_entry;
  28         struct ace_id *idp;
  29
  30         struct smb_acl_t *result = sys_acl_init();
  31         struct smb_acl_entry *ace;
  32         int i;
  33
  34         if (result == NULL) {
  35                 return NULL;
  36         }
  37
  38         /* Point to the first acl entry in the acl */
  39         acl_entry =  file_acl->acl_ext;
  40
  41
  42
  43         DEBUG(10,("acl_entry is %p\n",(void *)acl_entry));
  44         DEBUG(10,("acl_last(file_acl) id %p\n",(void *)acl_last(file_acl)));
  45
  46         /* Check if the extended acl bit is on.   *
  47          * If it isn't, do not show the           *
  48          * contents of the acl since AIX intends *
  49          * the extended info to remain unused     */
  50
  51         if(file_acl->acl_mode & S_IXACL){
  52                 /* while we are not pointing to the very end */
  53                 while(acl_entry < acl_last(file_acl)) {
  54                         /* before we malloc anything, make sure this is  */
  55                         /* a valid acl entry and one that we want to map */
  56                         idp = id_nxt(acl_entry->ace_id);
  57                         if((acl_entry->ace_type == ACC_SPECIFY ||
  58                                 (acl_entry->ace_type == ACC_PERMIT)) && (idp != id_last(acl_entry))) {
  59                                         acl_entry = acl_nxt(acl_entry);
  60                                         continue;
  61                         }
  62
  63                         idp = acl_entry->ace_id;
  64                         DEBUG(10,("idp->id_data is %d\n",idp->id_data[0]));
  65
  66                         result->acl = talloc_realloc(result, result->acl, struct smb_acl_entry, result->count+1);
  67                         if (result == NULL) {
  68                                 DEBUG(0, ("talloc_realloc failed\n"));
  69                                 errno = ENOMEM;
  70                                 return NULL;
  71                         }
  72
  73
  74                         DEBUG(10,("idp->id_type is %d\n",idp->id_type));
  75                         ace = &result->acl[result->count];
  76
  77                         ace->a_type = idp->id_type;
  78
  79                         switch(ace->a_type) {
  80                         case ACEID_USER: {
  81                         ace->info.user.uid = idp->id_data[0];
  82                         DEBUG(10,("case ACEID_USER ace->info.user.uid is %d\n",ace->info.user.uid));
  83                         ace->a_type = SMB_ACL_USER;
  84                         break;
  85                         }
  86
  87                         case ACEID_GROUP: {
  88                         ace->info.group.gid = idp->id_data[0];
  89                         DEBUG(10,("case ACEID_GROUP ace->info.group.gid is %d\n",ace->info.group.gid));
  90                         ace->a_type = SMB_ACL_GROUP;
  91                         break;
  92                         }
  93                         default:
  94                                 break;
  95                         }
  96                         /* The access in the acl entries must be left shifted by *
  97                          * three bites, because they will ultimately be compared *
  98                          * to S_IRUSR, S_IWUSR, and S_IXUSR.                  */
  99
 100                         switch(acl_entry->ace_type){
 101                         case ACC_PERMIT:
 102                         case ACC_SPECIFY:
 103                                 ace->a_perm = acl_entry->ace_access;
 104                                 ace->a_perm <<= 6;
 105                                 DEBUG(10,("ace->a_perm is %d\n",ace->a_perm));
 106                                 break;
 107                         case ACC_DENY:
 108                                 /* Since there is no way to return a DENY acl entry *
 109                                  * change to PERMIT and then shift.                 */
 110                                 DEBUG(10,("acl_entry->ace_access is %d\n",acl_entry->ace_access));
 111                                 ace->a_perm = ~acl_entry->ace_access & 7;
 112                                 DEBUG(10,("ace->a_perm is %d\n",ace->a_perm));
 113                                 ace->a_perm <<= 6;
 114                                 break;
 115                         default:
 116                                 DEBUG(0, ("unknown ace->type\n"));
 117                                 TALLOC_FREE(result);
 118                                 return(0);
 119                         }
 120
 121                         result->count++;
 122                         ace->a_perm |= (ace->a_perm & S_IRUSR) ? SMB_ACL_READ : 0;
 123                         ace->a_perm |= (ace->a_perm & S_IWUSR) ? SMB_ACL_WRITE : 0;
 124                         ace->a_perm |= (ace->a_perm & S_IXUSR) ? SMB_ACL_EXECUTE : 0;
 125                         DEBUG(10,("ace->a_perm is %d\n",ace->a_perm));
 126
 127                         DEBUG(10,("acl_entry = %p\n",(void *)acl_entry));
 128                         DEBUG(10,("The ace_type is %d\n",acl_entry->ace_type));
 129
 130                         acl_entry = acl_nxt(acl_entry);
 131                 }
 132         } /* end of if enabled */
 133
 134         /* Since owner, group, other acl entries are not *
 135          * part of the acl entries in an acl, they must  *
 136          * be dummied up to become part of the list.     */
 137
 138         for( i = 1; i < 4; i++) {
 139                 DEBUG(10,("i is %d\n",i));
 140
 141                 result->acl = talloc_realloc(result, result->acl, struct smb_acl_entry, result->count+1);
 142                 if (result->acl == NULL) {
 143                         TALLOC_FREE(result);
 144                         DEBUG(0, ("talloc_realloc failed\n"));
 145                         errno = ENOMEM;
 146                         DEBUG(0,("Error in AIX sys_acl_get_file is %d\n",errno));
 147                         return NULL;
 148                 }
 149
 150                 ace = &result->acl[result->count];
 151
 152                 ace->info.user.uid = 0;
 153                 ace->info.group.gid = 0;
 154                 DEBUG(10,("ace->info.user.uid = %d\n",ace->info.user.uid));
 155
 156                 switch(i) {
 157                 case 2:
 158                         ace->a_perm = file_acl->g_access << 6;
 159                         ace->a_type = SMB_ACL_GROUP_OBJ;
 160                         break;
 161
 162                 case 3:
 163                         ace->a_perm = file_acl->o_access << 6;
 164                         ace->a_type = SMB_ACL_OTHER;
 165                         break;
 166
 167                 case 1:
 168                         ace->a_perm = file_acl->u_access << 6;
 169                         ace->a_type = SMB_ACL_USER_OBJ;
 170                         break;
 171
 172                 default:
 173                         return(NULL);
 174
 175                 }
 176                 ace->a_perm |= ((ace->a_perm & S_IRUSR) ? SMB_ACL_READ : 0);
 177                 ace->a_perm |= ((ace->a_perm & S_IWUSR) ? SMB_ACL_WRITE : 0);
 178                 ace->a_perm |= ((ace->a_perm & S_IXUSR) ? SMB_ACL_EXECUTE : 0);
 179
 180                 memcpy(&result->acl[result->count],ace,sizeof(struct smb_acl_entry));
 181                 result->count++;
 182                 DEBUG(10,("ace->a_perm = %d\n",ace->a_perm));
 183                 DEBUG(10,("ace->a_type = %d\n",ace->a_type));
 184         }
 185
 186
 187         return result;
 188
 189
 190 }
 191
 192 static ushort aixacl_smb_to_aixperm(SMB_ACL_PERM_T a_perm)
 193 {
 194         ushort ret = (ushort)0;
 195         if (a_perm & SMB_ACL_READ)
 196                 ret |= R_ACC;
 197         if (a_perm & SMB_ACL_WRITE)
 198                 ret |= W_ACC;
 199         if (a_perm & SMB_ACL_EXECUTE)
 200                 ret |= X_ACC;
 201         return ret;
 202 }
 203
 204 struct acl *aixacl_smb_to_aixacl(SMB_ACL_TYPE_T acltype, SMB_ACL_T theacl)
 205 {
 206         struct smb_acl_entry *smb_entry = NULL;
 207         struct acl *file_acl = NULL;
 208         struct acl *file_acl_temp = NULL;
 209         struct acl_entry *acl_entry = NULL;
 210         struct ace_id *ace_id = NULL;
 211         unsigned int id_type;
 212         unsigned int acl_length;
 213         int     i;
 214
 215         DEBUG(10,("Entering aixacl_smb_to_aixacl\n"));
 216         /* AIX has no default ACL */
 217         if(acltype == SMB_ACL_TYPE_DEFAULT)
 218                 return NULL;
 219
 220         acl_length = BUFSIZ;
 221         file_acl = (struct acl *)SMB_MALLOC(BUFSIZ);
 222         if(file_acl == NULL) {
 223                 errno = ENOMEM;
 224                 DEBUG(0,("Error in aixacl_smb_to_aixacl is %d\n",errno));
 225                 return NULL;
 226         }
 227
 228         memset(file_acl,0,BUFSIZ);
 229
 230         file_acl->acl_len = ACL_SIZ;
 231         file_acl->acl_mode = S_IXACL;
 232
 233         for(i=0; i<theacl->count; i++ ) {
 234                 smb_entry = &(theacl->acl[i]);
 235                 id_type = smb_entry->a_type;
 236                 DEBUG(10,("The id_type is %d\n",id_type));
 237
 238                 switch(id_type) {
 239                         case SMB_ACL_USER_OBJ:
 240                                 file_acl->u_access = aixacl_smb_to_aixperm(smb_entry->a_perm);
 241                                 continue;
 242                         case SMB_ACL_GROUP_OBJ:
 243                                 file_acl->g_access = aixacl_smb_to_aixperm(smb_entry->a_perm);
 244                                 continue;
 245                         case SMB_ACL_OTHER:
 246                                 file_acl->o_access = aixacl_smb_to_aixperm(smb_entry->a_perm);
 247                                 continue;
 248                         case SMB_ACL_MASK:
 249                                 continue;
 250                         case SMB_ACL_GROUP:
 251                                 break; /* process this */
 252                         case SMB_ACL_USER:
 253                                 break; /* process this */
 254                         default: /* abnormal case */
 255                                 DEBUG(10,("The id_type is unknown !\n"));
 256                                 continue;
 257                 }
 258
 259                 if((file_acl->acl_len + sizeof(struct acl_entry)) > acl_length) {
 260                         acl_length += sizeof(struct acl_entry);
 261                         file_acl_temp = (struct acl *)SMB_MALLOC(acl_length);
 262                         if(file_acl_temp == NULL) {
 263                                 SAFE_FREE(file_acl);
 264                                 errno = ENOMEM;
 265                                 DEBUG(0,("Error in aixacl_smb_to_aixacl is %d\n",errno));
 266                                 return NULL;
 267                         }
 268
 269                         memcpy(file_acl_temp,file_acl,file_acl->acl_len);
 270                         SAFE_FREE(file_acl);
 271                         file_acl = file_acl_temp;
 272                 }
 273
 274                 acl_entry = (struct acl_entry *)((char *)file_acl + file_acl->acl_len);
 275                 file_acl->acl_len += sizeof(struct acl_entry);
 276                 acl_entry->ace_len = sizeof(struct acl_entry); /* contains 1 ace_id */
 277                 acl_entry->ace_access = aixacl_smb_to_aixperm(smb_entry->a_perm);
 278
 279                 /* In order to use this, we'll need to wait until we can get denies */
 280                 /* if(!acl_entry->ace_access && acl_entry->ace_type == ACC_PERMIT)
 281                 acl_entry->ace_type = ACC_SPECIFY; */
 282
 283                 acl_entry->ace_type = ACC_SPECIFY;
 284
 285                 ace_id = acl_entry->ace_id;
 286
 287                 ace_id->id_type = (smb_entry->a_type==SMB_ACL_GROUP) ? ACEID_GROUP : ACEID_USER;
 288                 DEBUG(10,("The id type is %d\n",ace_id->id_type));
 289                 ace_id->id_len = sizeof(struct ace_id); /* contains 1 id_data */
 290                 ace_id->id_data[0] = (smb_entry->a_type==SMB_ACL_GROUP) ? smb_entry->info.group.gid : smb_entry->info.user.uid;
 291         }
 292
 293         return file_acl;
 294 }