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, TALLOC_CTX *mem_ctx)
  26 {
  27         struct acl_entry *acl_entry;
  28         struct ace_id *idp;
  29
  30         struct smb_acl_t *result = sys_acl_init(mem_ctx);
  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         DEBUG(10,("acl_entry is %p\n",(void *)acl_entry));
  42         DEBUG(10,("acl_last(file_acl) id %p\n",(void *)acl_last(file_acl)));
  43
  44         /* Check if the extended acl bit is on.   *
  45          * If it isn't, do not show the           *
  46          * contents of the acl since AIX intends *
  47          * the extended info to remain unused     */
  48
  49         if(file_acl->acl_mode & S_IXACL){
  50                 /* while we are not pointing to the very end */
  51                 while(acl_entry < acl_last(file_acl)) {
  52                         /* before we malloc anything, make sure this is  */
  53                         /* a valid acl entry and one that we want to map */
  54                         idp = id_nxt(acl_entry->ace_id);
  55                         if((acl_entry->ace_type == ACC_SPECIFY ||
  56                                 (acl_entry->ace_type == ACC_PERMIT)) && (idp != id_last(acl_entry))) {
  57                                         acl_entry = acl_nxt(acl_entry);
  58                                         continue;
  59                         }
  60
  61                         idp = acl_entry->ace_id;
  62                         DEBUG(10,("idp->id_data is %d\n",idp->id_data[0]));
  63
  64                         result->acl = talloc_realloc(result, result->acl, struct smb_acl_entry, result->count+1);
  65                         if (result == NULL) {
  66                                 DEBUG(0, ("talloc_realloc failed\n"));
  67                                 errno = ENOMEM;
  68                                 return NULL;
  69                         }
  70
  71                         DEBUG(10,("idp->id_type is %d\n",idp->id_type));
  72                         ace = &result->acl[result->count];
  73
  74                         ace->a_type = idp->id_type;
  75
  76                         switch(ace->a_type) {
  77                         case ACEID_USER: {
  78                         ace->info.user.uid = idp->id_data[0];
  79                         DEBUG(10,("case ACEID_USER ace->info.user.uid is %d\n",ace->info.user.uid));
  80                         ace->a_type = SMB_ACL_USER;
  81                         break;
  82                         }
  83
  84                         case ACEID_GROUP: {
  85                         ace->info.group.gid = idp->id_data[0];
  86                         DEBUG(10,("case ACEID_GROUP ace->info.group.gid is %d\n",ace->info.group.gid));
  87                         ace->a_type = SMB_ACL_GROUP;
  88                         break;
  89                         }
  90                         default:
  91                                 break;
  92                         }
  93                         /* The access in the acl entries must be left shifted by *
  94                          * three bites, because they will ultimately be compared *
  95                          * to S_IRUSR, S_IWUSR, and S_IXUSR.                  */
  96
  97                         switch(acl_entry->ace_type){
  98                         case ACC_PERMIT:
  99                         case ACC_SPECIFY:
 100                                 ace->a_perm = acl_entry->ace_access;
 101                                 ace->a_perm <<= 6;
 102                                 DEBUG(10,("ace->a_perm is %d\n",ace->a_perm));
 103                                 break;
 104                         case ACC_DENY:
 105                                 /* Since there is no way to return a DENY acl entry *
 106                                  * change to PERMIT and then shift.                 */
 107                                 DEBUG(10,("acl_entry->ace_access is %d\n",acl_entry->ace_access));
 108                                 ace->a_perm = ~acl_entry->ace_access & 7;
 109                                 DEBUG(10,("ace->a_perm is %d\n",ace->a_perm));
 110                                 ace->a_perm <<= 6;
 111                                 break;
 112                         default:
 113                                 DEBUG(0, ("unknown ace->type\n"));
 114                                 TALLOC_FREE(result);
 115                                 return(0);
 116                         }
 117
 118                         result->count++;
 119                         ace->a_perm |= (ace->a_perm & S_IRUSR) ? SMB_ACL_READ : 0;
 120                         ace->a_perm |= (ace->a_perm & S_IWUSR) ? SMB_ACL_WRITE : 0;
 121                         ace->a_perm |= (ace->a_perm & S_IXUSR) ? SMB_ACL_EXECUTE : 0;
 122                         DEBUG(10,("ace->a_perm is %d\n",ace->a_perm));
 123
 124                         DEBUG(10,("acl_entry = %p\n",(void *)acl_entry));
 125                         DEBUG(10,("The ace_type is %d\n",acl_entry->ace_type));
 126
 127                         acl_entry = acl_nxt(acl_entry);
 128                 }
 129         } /* end of if enabled */
 130
 131         /* Since owner, group, other acl entries are not *
 132          * part of the acl entries in an acl, they must  *
 133          * be dummied up to become part of the list.     */
 134
 135         for( i = 1; i < 4; i++) {
 136                 DEBUG(10,("i is %d\n",i));
 137
 138                 result->acl = talloc_realloc(result, result->acl, struct smb_acl_entry, result->count+1);
 139                 if (result->acl == NULL) {
 140                         TALLOC_FREE(result);
 141                         DEBUG(0, ("talloc_realloc failed\n"));
 142                         errno = ENOMEM;
 143                         DEBUG(0,("Error in AIX sys_acl_get_file is %d\n",errno));
 144                         return NULL;
 145                 }
 146
 147                 ace = &result->acl[result->count];
 148
 149                 ace->info.user.uid = 0;
 150                 ace->info.group.gid = 0;
 151                 DEBUG(10,("ace->info.user.uid = %d\n",ace->info.user.uid));
 152
 153                 switch(i) {
 154                 case 2:
 155                         ace->a_perm = file_acl->g_access << 6;
 156                         ace->a_type = SMB_ACL_GROUP_OBJ;
 157                         break;
 158
 159                 case 3:
 160                         ace->a_perm = file_acl->o_access << 6;
 161                         ace->a_type = SMB_ACL_OTHER;
 162                         break;
 163
 164                 case 1:
 165                         ace->a_perm = file_acl->u_access << 6;
 166                         ace->a_type = SMB_ACL_USER_OBJ;
 167                         break;
 168
 169                 default:
 170                         return(NULL);
 171
 172                 }
 173                 ace->a_perm |= ((ace->a_perm & S_IRUSR) ? SMB_ACL_READ : 0);
 174                 ace->a_perm |= ((ace->a_perm & S_IWUSR) ? SMB_ACL_WRITE : 0);
 175                 ace->a_perm |= ((ace->a_perm & S_IXUSR) ? SMB_ACL_EXECUTE : 0);
 176
 177                 memcpy(&result->acl[result->count],ace,sizeof(struct smb_acl_entry));
 178                 result->count++;
 179                 DEBUG(10,("ace->a_perm = %d\n",ace->a_perm));
 180                 DEBUG(10,("ace->a_type = %d\n",ace->a_type));
 181         }
 182
 183         return result;
 184 }
 185
 186 static ushort aixacl_smb_to_aixperm(SMB_ACL_PERM_T a_perm)
 187 {
 188         ushort ret = (ushort)0;
 189         if (a_perm & SMB_ACL_READ)
 190                 ret |= R_ACC;
 191         if (a_perm & SMB_ACL_WRITE)
 192                 ret |= W_ACC;
 193         if (a_perm & SMB_ACL_EXECUTE)
 194                 ret |= X_ACC;
 195         return ret;
 196 }
 197
 198 struct acl *aixacl_smb_to_aixacl(SMB_ACL_TYPE_T acltype, SMB_ACL_T theacl)
 199 {
 200         struct smb_acl_entry *smb_entry = NULL;
 201         struct acl *file_acl = NULL;
 202         struct acl *file_acl_temp = NULL;
 203         struct acl_entry *acl_entry = NULL;
 204         struct ace_id *ace_id = NULL;
 205         unsigned int id_type;
 206         unsigned int acl_length;
 207         int     i;
 208
 209         DEBUG(10,("Entering aixacl_smb_to_aixacl\n"));
 210         /* AIX has no default ACL */
 211         if(acltype == SMB_ACL_TYPE_DEFAULT)
 212                 return NULL;
 213
 214         acl_length = BUFSIZ;
 215         file_acl = (struct acl *)SMB_MALLOC(BUFSIZ);
 216         if(file_acl == NULL) {
 217                 errno = ENOMEM;
 218                 DEBUG(0,("Error in aixacl_smb_to_aixacl is %d\n",errno));
 219                 return NULL;
 220         }
 221
 222         memset(file_acl,0,BUFSIZ);
 223
 224         file_acl->acl_len = ACL_SIZ;
 225         file_acl->acl_mode = S_IXACL;
 226
 227         for(i=0; i<theacl->count; i++ ) {
 228                 smb_entry = &(theacl->acl[i]);
 229                 id_type = smb_entry->a_type;
 230                 DEBUG(10,("The id_type is %d\n",id_type));
 231
 232                 switch(id_type) {
 233                         case SMB_ACL_USER_OBJ:
 234                                 file_acl->u_access = aixacl_smb_to_aixperm(smb_entry->a_perm);
 235                                 continue;
 236                         case SMB_ACL_GROUP_OBJ:
 237                                 file_acl->g_access = aixacl_smb_to_aixperm(smb_entry->a_perm);
 238                                 continue;
 239                         case SMB_ACL_OTHER:
 240                                 file_acl->o_access = aixacl_smb_to_aixperm(smb_entry->a_perm);
 241                                 continue;
 242                         case SMB_ACL_MASK:
 243                                 continue;
 244                         case SMB_ACL_GROUP:
 245                                 break; /* process this */
 246                         case SMB_ACL_USER:
 247                                 break; /* process this */
 248                         default: /* abnormal case */
 249                                 DEBUG(10,("The id_type is unknown !\n"));
 250                                 continue;
 251                 }
 252
 253                 if((file_acl->acl_len + sizeof(struct acl_entry)) > acl_length) {
 254                         acl_length += sizeof(struct acl_entry);
 255                         file_acl_temp = (struct acl *)SMB_MALLOC(acl_length);
 256                         if(file_acl_temp == NULL) {
 257                                 SAFE_FREE(file_acl);
 258                                 errno = ENOMEM;
 259                                 DEBUG(0,("Error in aixacl_smb_to_aixacl is %d\n",errno));
 260                                 return NULL;
 261                         }
 262
 263                         memcpy(file_acl_temp,file_acl,file_acl->acl_len);
 264                         SAFE_FREE(file_acl);
 265                         file_acl = file_acl_temp;
 266                 }
 267
 268                 acl_entry = (struct acl_entry *)((char *)file_acl + file_acl->acl_len);
 269                 file_acl->acl_len += sizeof(struct acl_entry);
 270                 acl_entry->ace_len = sizeof(struct acl_entry); /* contains 1 ace_id */
 271                 acl_entry->ace_access = aixacl_smb_to_aixperm(smb_entry->a_perm);
 272
 273                 /* In order to use this, we'll need to wait until we can get denies */
 274                 /* if(!acl_entry->ace_access && acl_entry->ace_type == ACC_PERMIT)
 275                 acl_entry->ace_type = ACC_SPECIFY; */
 276
 277                 acl_entry->ace_type = ACC_SPECIFY;
 278
 279                 ace_id = acl_entry->ace_id;
 280
 281                 ace_id->id_type = (smb_entry->a_type==SMB_ACL_GROUP) ? ACEID_GROUP : ACEID_USER;
 282                 DEBUG(10,("The id type is %d\n",ace_id->id_type));
 283                 ace_id->id_len = sizeof(struct ace_id); /* contains 1 id_data */
 284                 ace_id->id_data[0] = (smb_entry->a_type==SMB_ACL_GROUP) ? smb_entry->info.group.gid : smb_entry->info.user.uid;
 285         }
 286
 287         return file_acl;
 288 }