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
  24 SMB_ACL_T aixacl_to_smbacl(struct acl *file_acl)
  25 {
  26         struct acl_entry *acl_entry;
  27         struct ace_id *idp;
  28
  29         struct smb_acl_t *result = SMB_MALLOC_P(struct smb_acl_t);
  30         struct smb_acl_entry *ace;
  31         int i;
  32
  33         if (result == NULL) {
  34                 return NULL;
  35         }
  36         ZERO_STRUCTP(result);
  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 = SMB_REALLOC(result, sizeof(struct smb_acl_t) +
  67                                      (sizeof(struct smb_acl_entry) *
  68                                       (result->count+1)));
  69                         if (result == NULL) {
  70                                 DEBUG(0, ("SMB_REALLOC failed\n"));
  71                                 errno = ENOMEM;
  72                                 return NULL;
  73                         }
  74
  75
  76                         DEBUG(10,("idp->id_type is %d\n",idp->id_type));
  77                         ace = &result->acl[result->count];
  78
  79                         ace->a_type = idp->id_type;
  80
  81                         switch(ace->a_type) {
  82                         case ACEID_USER: {
  83                         ace->uid = idp->id_data[0];
  84                         DEBUG(10,("case ACEID_USER ace->uid is %d\n",ace->uid));
  85                         ace->a_type = SMB_ACL_USER;
  86                         break;
  87                         }
  88
  89                         case ACEID_GROUP: {
  90                         ace->gid = idp->id_data[0];
  91                         DEBUG(10,("case ACEID_GROUP ace->gid is %d\n",ace->gid));
  92                         ace->a_type = SMB_ACL_GROUP;
  93                         break;
  94                         }
  95                         default:
  96                                 break;
  97                         }
  98                         /* The access in the acl entries must be left shifted by *
  99                          * three bites, because they will ultimately be compared *
 100                          * to S_IRUSR, S_IWUSR, and S_IXUSR.                  */
 101
 102                         switch(acl_entry->ace_type){
 103                         case ACC_PERMIT:
 104                         case ACC_SPECIFY:
 105                                 ace->a_perm = acl_entry->ace_access;
 106                                 ace->a_perm <<= 6;
 107                                 DEBUG(10,("ace->a_perm is %d\n",ace->a_perm));
 108                                 break;
 109                         case ACC_DENY:
 110                                 /* Since there is no way to return a DENY acl entry *
 111                                  * change to PERMIT and then shift.                 */
 112                                 DEBUG(10,("acl_entry->ace_access is %d\n",acl_entry->ace_access));
 113                                 ace->a_perm = ~acl_entry->ace_access & 7;
 114                                 DEBUG(10,("ace->a_perm is %d\n",ace->a_perm));
 115                                 ace->a_perm <<= 6;
 116                                 break;
 117                         default:
 118                                 DEBUG(0, ("unknown ace->type\n"));
 119                                 SAFE_FREE(result);
 120                                 return(0);
 121                         }
 122
 123                         result->count++;
 124                         ace->a_perm |= (ace->a_perm & S_IRUSR) ? SMB_ACL_READ : 0;
 125                         ace->a_perm |= (ace->a_perm & S_IWUSR) ? SMB_ACL_WRITE : 0;
 126                         ace->a_perm |= (ace->a_perm & S_IXUSR) ? SMB_ACL_EXECUTE : 0;
 127                         DEBUG(10,("ace->a_perm is %d\n",ace->a_perm));
 128
 129                         DEBUG(10,("acl_entry = %p\n",(void *)acl_entry));
 130                         DEBUG(10,("The ace_type is %d\n",acl_entry->ace_type));
 131
 132                         acl_entry = acl_nxt(acl_entry);
 133                 }
 134         } /* end of if enabled */
 135
 136         /* Since owner, group, other acl entries are not *
 137          * part of the acl entries in an acl, they must  *
 138          * be dummied up to become part of the list.     */
 139
 140         for( i = 1; i < 4; i++) {
 141                 DEBUG(10,("i is %d\n",i));
 142
 143                         result = SMB_REALLOC(result, sizeof(struct smb_acl_t) +
 144                                      (sizeof(struct smb_acl_entry) *
 145                                       (result->count+1)));
 146                         if (result == NULL) {
 147                                 DEBUG(0, ("SMB_REALLOC failed\n"));
 148                                 errno = ENOMEM;
 149                                 DEBUG(0,("Error in AIX sys_acl_get_file is %d\n",errno));
 150                                 return NULL;
 151                         }
 152
 153                 ace = &result->acl[result->count];
 154
 155                 ace->uid = 0;
 156                 ace->gid = 0;
 157                 DEBUG(10,("ace->uid = %d\n",ace->uid));
 158
 159                 switch(i) {
 160                 case 2:
 161                         ace->a_perm = file_acl->g_access << 6;
 162                         ace->a_type = SMB_ACL_GROUP_OBJ;
 163                         break;
 164
 165                 case 3:
 166                         ace->a_perm = file_acl->o_access << 6;
 167                         ace->a_type = SMB_ACL_OTHER;
 168                         break;
 169
 170                 case 1:
 171                         ace->a_perm = file_acl->u_access << 6;
 172                         ace->a_type = SMB_ACL_USER_OBJ;
 173                         break;
 174
 175                 default:
 176                         return(NULL);
 177
 178                 }
 179                 ace->a_perm |= ((ace->a_perm & S_IRUSR) ? SMB_ACL_READ : 0);
 180                 ace->a_perm |= ((ace->a_perm & S_IWUSR) ? SMB_ACL_WRITE : 0);
 181                 ace->a_perm |= ((ace->a_perm & S_IXUSR) ? SMB_ACL_EXECUTE : 0);
 182
 183                 memcpy(&result->acl[result->count],ace,sizeof(struct smb_acl_entry));
 184                 result->count++;
 185                 DEBUG(10,("ace->a_perm = %d\n",ace->a_perm));
 186                 DEBUG(10,("ace->a_type = %d\n",ace->a_type));
 187         }
 188
 189
 190         return result;
 191
 192
 193 }
 194
 195 static ushort aixacl_smb_to_aixperm(SMB_ACL_PERM_T a_perm)
 196 {
 197         ushort ret = (ushort)0;
 198         if (a_perm & SMB_ACL_READ)
 199                 ret |= R_ACC;
 200         if (a_perm & SMB_ACL_WRITE)
 201                 ret |= W_ACC;
 202         if (a_perm & SMB_ACL_EXECUTE)
 203                 ret |= X_ACC;
 204         return ret;
 205 }
 206
 207 struct acl *aixacl_smb_to_aixacl(SMB_ACL_TYPE_T acltype, SMB_ACL_T theacl)
 208 {
 209         struct smb_acl_entry *smb_entry = NULL;
 210         struct acl *file_acl = NULL;
 211         struct acl *file_acl_temp = NULL;
 212         struct acl_entry *acl_entry = NULL;
 213         struct ace_id *ace_id = NULL;
 214         unsigned int id_type;
 215         unsigned int acl_length;
 216         int     i;
 217
 218         DEBUG(10,("Entering aixacl_smb_to_aixacl\n"));
 219         /* AIX has no default ACL */
 220         if(acltype == SMB_ACL_TYPE_DEFAULT)
 221                 return NULL;
 222
 223         acl_length = BUFSIZ;
 224         file_acl = (struct acl *)SMB_MALLOC(BUFSIZ);
 225         if(file_acl == NULL) {
 226                 errno = ENOMEM;
 227                 DEBUG(0,("Error in aixacl_smb_to_aixacl is %d\n",errno));
 228                 return NULL;
 229         }
 230
 231         memset(file_acl,0,BUFSIZ);
 232
 233         file_acl->acl_len = ACL_SIZ;
 234         file_acl->acl_mode = S_IXACL;
 235
 236         for(i=0; i<theacl->count; i++ ) {
 237                 smb_entry = &(theacl->acl[i]);
 238                 id_type = smb_entry->a_type;
 239                 DEBUG(10,("The id_type is %d\n",id_type));
 240
 241                 switch(id_type) {
 242                         case SMB_ACL_USER_OBJ:
 243                                 file_acl->u_access = aixacl_smb_to_aixperm(smb_entry->a_perm);
 244                                 continue;
 245                         case SMB_ACL_GROUP_OBJ:
 246                                 file_acl->g_access = aixacl_smb_to_aixperm(smb_entry->a_perm);
 247                                 continue;
 248                         case SMB_ACL_OTHER:
 249                                 file_acl->o_access = aixacl_smb_to_aixperm(smb_entry->a_perm);
 250                                 continue;
 251                         case SMB_ACL_MASK:
 252                                 continue;
 253                         case SMB_ACL_GROUP:
 254                                 break; /* process this */
 255                         case SMB_ACL_USER:
 256                                 break; /* process this */
 257                         default: /* abnormal case */
 258                                 DEBUG(10,("The id_type is unknown !\n"));
 259                                 continue;
 260                 }
 261
 262                 if((file_acl->acl_len + sizeof(struct acl_entry)) > acl_length) {
 263                         acl_length += sizeof(struct acl_entry);
 264                         file_acl_temp = (struct acl *)SMB_MALLOC(acl_length);
 265                         if(file_acl_temp == NULL) {
 266                                 SAFE_FREE(file_acl);
 267                                 errno = ENOMEM;
 268                                 DEBUG(0,("Error in aixacl_smb_to_aixacl is %d\n",errno));
 269                                 return NULL;
 270                         }
 271
 272                         memcpy(file_acl_temp,file_acl,file_acl->acl_len);
 273                         SAFE_FREE(file_acl);
 274                         file_acl = file_acl_temp;
 275                 }
 276
 277                 acl_entry = (struct acl_entry *)((char *)file_acl + file_acl->acl_len);
 278                 file_acl->acl_len += sizeof(struct acl_entry);
 279                 acl_entry->ace_len = sizeof(struct acl_entry); /* contains 1 ace_id */
 280                 acl_entry->ace_access = aixacl_smb_to_aixperm(smb_entry->a_perm);
 281
 282                 /* In order to use this, we'll need to wait until we can get denies */
 283                 /* if(!acl_entry->ace_access && acl_entry->ace_type == ACC_PERMIT)
 284                 acl_entry->ace_type = ACC_SPECIFY; */
 285
 286                 acl_entry->ace_type = ACC_SPECIFY;
 287
 288                 ace_id = acl_entry->ace_id;
 289
 290                 ace_id->id_type = (smb_entry->a_type==SMB_ACL_GROUP) ? ACEID_GROUP : ACEID_USER;
 291                 DEBUG(10,("The id type is %d\n",ace_id->id_type));
 292                 ace_id->id_len = sizeof(struct ace_id); /* contains 1 id_data */
 293                 ace_id->id_data[0] = (smb_entry->a_type==SMB_ACL_GROUP) ? smb_entry->gid : smb_entry->uid;
 294         }
 295
 296         return file_acl;
 297 }