| /* Test whether a file has a nontrivial ACL. -*- coding: utf-8 -*- |
| |
| Copyright (C) 2002-2003, 2005-2020 Free Software Foundation, Inc. |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <https://www.gnu.org/licenses/>. |
| |
| Written by Paul Eggert, Andreas Grünbacher, and Bruno Haible. */ |
| |
| #include <config.h> |
| |
| #include "acl.h" |
| |
| #include "acl-internal.h" |
| |
| #if USE_ACL && HAVE_ACL_GET_FILE /* Linux, FreeBSD, Mac OS X, IRIX, Tru64, Cygwin >= 2.5 */ |
| |
| # if HAVE_ACL_TYPE_EXTENDED /* Mac OS X */ |
| |
| /* ACL is an ACL, from a file, stored as type ACL_TYPE_EXTENDED. |
| Return 1 if the given ACL is non-trivial. |
| Return 0 if it is trivial. */ |
| int |
| acl_extended_nontrivial (acl_t acl) |
| { |
| /* acl is non-trivial if it is non-empty. */ |
| return (acl_entries (acl) > 0); |
| } |
| |
| # else /* Linux, FreeBSD, IRIX, Tru64, Cygwin >= 2.5 */ |
| |
| /* ACL is an ACL, from a file, stored as type ACL_TYPE_ACCESS. |
| Return 1 if the given ACL is non-trivial. |
| Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. |
| Return -1 and set errno upon failure to determine it. */ |
| int |
| acl_access_nontrivial (acl_t acl) |
| { |
| /* acl is non-trivial if it has some entries other than for "user::", |
| "group::", and "other::". Normally these three should be present |
| at least, allowing us to write |
| return (3 < acl_entries (acl)); |
| but the following code is more robust. */ |
| # if HAVE_ACL_FIRST_ENTRY /* Linux, FreeBSD, Cygwin >= 2.5 */ |
| |
| acl_entry_t ace; |
| int got_one; |
| |
| for (got_one = acl_get_entry (acl, ACL_FIRST_ENTRY, &ace); |
| got_one > 0; |
| got_one = acl_get_entry (acl, ACL_NEXT_ENTRY, &ace)) |
| { |
| acl_tag_t tag; |
| if (acl_get_tag_type (ace, &tag) < 0) |
| return -1; |
| if (!(tag == ACL_USER_OBJ || tag == ACL_GROUP_OBJ || tag == ACL_OTHER)) |
| return 1; |
| } |
| return got_one; |
| |
| # elif HAVE_ACL_TO_SHORT_TEXT /* IRIX */ |
| /* Don't use acl_get_entry: it is undocumented. */ |
| |
| int count = acl->acl_cnt; |
| int i; |
| |
| for (i = 0; i < count; i++) |
| { |
| acl_entry_t ace = &acl->acl_entry[i]; |
| acl_tag_t tag = ace->ae_tag; |
| |
| if (!(tag == ACL_USER_OBJ || tag == ACL_GROUP_OBJ |
| || tag == ACL_OTHER_OBJ)) |
| return 1; |
| } |
| return 0; |
| |
| # elif HAVE_ACL_FREE_TEXT /* Tru64 */ |
| /* Don't use acl_get_entry: it takes only one argument and does not work. */ |
| |
| int count = acl->acl_num; |
| acl_entry_t ace; |
| |
| for (ace = acl->acl_first; count > 0; ace = ace->next, count--) |
| { |
| acl_tag_t tag; |
| acl_perm_t perm; |
| |
| tag = ace->entry->acl_type; |
| if (!(tag == ACL_USER_OBJ || tag == ACL_GROUP_OBJ || tag == ACL_OTHER)) |
| return 1; |
| |
| perm = ace->entry->acl_perm; |
| /* On Tru64, perm can also contain non-standard bits such as |
| PERM_INSERT, PERM_DELETE, PERM_MODIFY, PERM_LOOKUP, ... */ |
| if ((perm & ~(ACL_READ | ACL_WRITE | ACL_EXECUTE)) != 0) |
| return 1; |
| } |
| return 0; |
| |
| # else |
| |
| errno = ENOSYS; |
| return -1; |
| # endif |
| } |
| |
| int |
| acl_default_nontrivial (acl_t acl) |
| { |
| /* acl is non-trivial if it is non-empty. */ |
| return (acl_entries (acl) > 0); |
| } |
| |
| # endif |
| |
| #elif USE_ACL && HAVE_FACL && defined GETACL /* Solaris, Cygwin < 2.5, not HP-UX */ |
| |
| /* Test an ACL retrieved with GETACL. |
| Return 1 if the given ACL, consisting of COUNT entries, is non-trivial. |
| Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */ |
| int |
| acl_nontrivial (int count, aclent_t *entries) |
| { |
| int i; |
| |
| for (i = 0; i < count; i++) |
| { |
| aclent_t *ace = &entries[i]; |
| |
| /* Note: If ace->a_type = USER_OBJ, ace->a_id is the st_uid from stat(). |
| If ace->a_type = GROUP_OBJ, ace->a_id is the st_gid from stat(). |
| We don't need to check ace->a_id in these cases. */ |
| if (!(ace->a_type == USER_OBJ |
| || ace->a_type == GROUP_OBJ |
| || ace->a_type == OTHER_OBJ |
| /* Note: Cygwin does not return a CLASS_OBJ ("mask:") entry |
| sometimes. */ |
| || ace->a_type == CLASS_OBJ)) |
| return 1; |
| } |
| return 0; |
| } |
| |
| # ifdef ACE_GETACL |
| |
| /* A shortcut for a bitmask. */ |
| # define NEW_ACE_WRITEA_DATA (NEW_ACE_WRITE_DATA | NEW_ACE_APPEND_DATA) |
| |
| /* Test an ACL retrieved with ACE_GETACL. |
| Return 1 if the given ACL, consisting of COUNT entries, is non-trivial. |
| Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */ |
| int |
| acl_ace_nontrivial (int count, ace_t *entries) |
| { |
| int i; |
| |
| /* The flags in the ace_t structure changed in a binary incompatible way |
| when ACL_NO_TRIVIAL etc. were introduced in <sys/acl.h> version 1.15. |
| How to distinguish the two conventions at runtime? |
| In the old convention, usually three ACEs have a_flags = ACE_OWNER / |
| ACE_GROUP / ACE_OTHER, in the range 0x0100..0x0400. In the new |
| convention, these values are not used. */ |
| int old_convention = 0; |
| |
| for (i = 0; i < count; i++) |
| if (entries[i].a_flags & (OLD_ACE_OWNER | OLD_ACE_GROUP | OLD_ACE_OTHER)) |
| { |
| old_convention = 1; |
| break; |
| } |
| |
| if (old_convention) |
| /* Running on Solaris 10. */ |
| for (i = 0; i < count; i++) |
| { |
| ace_t *ace = &entries[i]; |
| |
| /* Note: |
| If ace->a_flags = ACE_OWNER, ace->a_who is the st_uid from stat(). |
| If ace->a_flags = ACE_GROUP, ace->a_who is the st_gid from stat(). |
| We don't need to check ace->a_who in these cases. */ |
| if (!(ace->a_type == OLD_ALLOW |
| && (ace->a_flags == OLD_ACE_OWNER |
| || ace->a_flags == OLD_ACE_GROUP |
| || ace->a_flags == OLD_ACE_OTHER))) |
| return 1; |
| } |
| else |
| { |
| /* Running on Solaris 10 (newer version) or Solaris 11. */ |
| unsigned int access_masks[6] = |
| { |
| 0, /* owner@ deny */ |
| 0, /* owner@ allow */ |
| 0, /* group@ deny */ |
| 0, /* group@ allow */ |
| 0, /* everyone@ deny */ |
| 0 /* everyone@ allow */ |
| }; |
| |
| for (i = 0; i < count; i++) |
| { |
| ace_t *ace = &entries[i]; |
| unsigned int index1; |
| unsigned int index2; |
| |
| if (ace->a_type == NEW_ACE_ACCESS_ALLOWED_ACE_TYPE) |
| index1 = 1; |
| else if (ace->a_type == NEW_ACE_ACCESS_DENIED_ACE_TYPE) |
| index1 = 0; |
| else |
| return 1; |
| |
| if (ace->a_flags == NEW_ACE_OWNER) |
| index2 = 0; |
| else if (ace->a_flags == (NEW_ACE_GROUP | NEW_ACE_IDENTIFIER_GROUP)) |
| index2 = 2; |
| else if (ace->a_flags == NEW_ACE_EVERYONE) |
| index2 = 4; |
| else |
| return 1; |
| |
| access_masks[index1 + index2] |= ace->a_access_mask; |
| } |
| |
| /* The same bit shouldn't be both allowed and denied. */ |
| if (access_masks[0] & access_masks[1]) |
| return 1; |
| if (access_masks[2] & access_masks[3]) |
| return 1; |
| if (access_masks[4] & access_masks[5]) |
| return 1; |
| |
| /* Check minimum masks. */ |
| if ((NEW_ACE_WRITE_NAMED_ATTRS |
| | NEW_ACE_WRITE_ATTRIBUTES |
| | NEW_ACE_WRITE_ACL |
| | NEW_ACE_WRITE_OWNER) |
| & ~ access_masks[1]) |
| return 1; |
| access_masks[1] &= ~(NEW_ACE_WRITE_NAMED_ATTRS |
| | NEW_ACE_WRITE_ATTRIBUTES |
| | NEW_ACE_WRITE_ACL |
| | NEW_ACE_WRITE_OWNER); |
| if ((NEW_ACE_READ_NAMED_ATTRS |
| | NEW_ACE_READ_ATTRIBUTES |
| | NEW_ACE_READ_ACL |
| | NEW_ACE_SYNCHRONIZE) |
| & ~ access_masks[5]) |
| return 1; |
| access_masks[5] &= ~(NEW_ACE_READ_NAMED_ATTRS |
| | NEW_ACE_READ_ATTRIBUTES |
| | NEW_ACE_READ_ACL |
| | NEW_ACE_SYNCHRONIZE); |
| |
| /* Check the allowed or denied bits. */ |
| switch ((access_masks[0] | access_masks[1]) |
| & ~(NEW_ACE_READ_NAMED_ATTRS |
| | NEW_ACE_READ_ATTRIBUTES |
| | NEW_ACE_READ_ACL |
| | NEW_ACE_SYNCHRONIZE)) |
| { |
| case 0: |
| case NEW_ACE_READ_DATA: |
| case NEW_ACE_WRITEA_DATA: |
| case NEW_ACE_READ_DATA | NEW_ACE_WRITEA_DATA: |
| case NEW_ACE_EXECUTE: |
| case NEW_ACE_READ_DATA | NEW_ACE_EXECUTE: |
| case NEW_ACE_WRITEA_DATA | NEW_ACE_EXECUTE: |
| case NEW_ACE_READ_DATA | NEW_ACE_WRITEA_DATA | NEW_ACE_EXECUTE: |
| break; |
| default: |
| return 1; |
| } |
| switch ((access_masks[2] | access_masks[3]) |
| & ~(NEW_ACE_READ_NAMED_ATTRS |
| | NEW_ACE_READ_ATTRIBUTES |
| | NEW_ACE_READ_ACL |
| | NEW_ACE_SYNCHRONIZE)) |
| { |
| case 0: |
| case NEW_ACE_READ_DATA: |
| case NEW_ACE_WRITEA_DATA: |
| case NEW_ACE_READ_DATA | NEW_ACE_WRITEA_DATA: |
| case NEW_ACE_EXECUTE: |
| case NEW_ACE_READ_DATA | NEW_ACE_EXECUTE: |
| case NEW_ACE_WRITEA_DATA | NEW_ACE_EXECUTE: |
| case NEW_ACE_READ_DATA | NEW_ACE_WRITEA_DATA | NEW_ACE_EXECUTE: |
| break; |
| default: |
| return 1; |
| } |
| switch ((access_masks[4] | access_masks[5]) |
| & ~(NEW_ACE_WRITE_NAMED_ATTRS |
| | NEW_ACE_WRITE_ATTRIBUTES |
| | NEW_ACE_WRITE_ACL |
| | NEW_ACE_WRITE_OWNER)) |
| { |
| case 0: |
| case NEW_ACE_READ_DATA: |
| case NEW_ACE_WRITEA_DATA: |
| case NEW_ACE_READ_DATA | NEW_ACE_WRITEA_DATA: |
| case NEW_ACE_EXECUTE: |
| case NEW_ACE_READ_DATA | NEW_ACE_EXECUTE: |
| case NEW_ACE_WRITEA_DATA | NEW_ACE_EXECUTE: |
| case NEW_ACE_READ_DATA | NEW_ACE_WRITEA_DATA | NEW_ACE_EXECUTE: |
| break; |
| default: |
| return 1; |
| } |
| |
| /* Check that the NEW_ACE_WRITE_DATA and NEW_ACE_APPEND_DATA bits are |
| either both allowed or both denied. */ |
| if (((access_masks[0] & NEW_ACE_WRITE_DATA) != 0) |
| != ((access_masks[0] & NEW_ACE_APPEND_DATA) != 0)) |
| return 1; |
| if (((access_masks[2] & NEW_ACE_WRITE_DATA) != 0) |
| != ((access_masks[2] & NEW_ACE_APPEND_DATA) != 0)) |
| return 1; |
| if (((access_masks[4] & NEW_ACE_WRITE_DATA) != 0) |
| != ((access_masks[4] & NEW_ACE_APPEND_DATA) != 0)) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| # endif |
| |
| #elif USE_ACL && HAVE_GETACL /* HP-UX */ |
| |
| /* Return 1 if the given ACL is non-trivial. |
| Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */ |
| int |
| acl_nontrivial (int count, struct acl_entry *entries) |
| { |
| int i; |
| |
| if (count > 3) |
| return 1; |
| |
| for (i = 0; i < count; i++) |
| { |
| struct acl_entry *ace = &entries[i]; |
| |
| if (ace->uid != ACL_NSUSER && ace->gid != ACL_NSGROUP) |
| return 1; |
| } |
| return 0; |
| } |
| |
| # if HAVE_ACLV_H /* HP-UX >= 11.11 */ |
| |
| /* Return 1 if the given ACL is non-trivial. |
| Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */ |
| int |
| aclv_nontrivial (int count, struct acl *entries) |
| { |
| int i; |
| |
| for (i = 0; i < count; i++) |
| { |
| struct acl *ace = &entries[i]; |
| |
| /* Note: If ace->a_type = USER_OBJ, ace->a_id is the st_uid from stat(). |
| If ace->a_type = GROUP_OBJ, ace->a_id is the st_gid from stat(). |
| We don't need to check ace->a_id in these cases. */ |
| if (!(ace->a_type == USER_OBJ /* no need to check ace->a_id here */ |
| || ace->a_type == GROUP_OBJ /* no need to check ace->a_id here */ |
| || ace->a_type == CLASS_OBJ |
| || ace->a_type == OTHER_OBJ)) |
| return 1; |
| } |
| return 0; |
| } |
| |
| # endif |
| |
| #elif USE_ACL && (HAVE_ACLX_GET || HAVE_STATACL) /* AIX */ |
| |
| /* Return 1 if the given ACL is non-trivial. |
| Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */ |
| int |
| acl_nontrivial (struct acl *a) |
| { |
| /* The normal way to iterate through an ACL is like this: |
| struct acl_entry *ace; |
| for (ace = a->acl_ext; ace != acl_last (a); ace = acl_nxt (ace)) |
| { |
| struct ace_id *aei; |
| switch (ace->ace_type) |
| { |
| case ACC_PERMIT: |
| case ACC_DENY: |
| case ACC_SPECIFY: |
| ...; |
| } |
| for (aei = ace->ace_id; aei != id_last (ace); aei = id_nxt (aei)) |
| ... |
| } |
| */ |
| return (acl_last (a) != a->acl_ext ? 1 : 0); |
| } |
| |
| # if HAVE_ACLX_GET && defined ACL_AIX_WIP /* newer AIX */ |
| |
| /* Return 1 if the given ACL is non-trivial. |
| Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */ |
| int |
| acl_nfs4_nontrivial (nfs4_acl_int_t *a) |
| { |
| # if 1 /* let's try this first */ |
| return (a->aclEntryN > 0 ? 1 : 0); |
| # else |
| int count = a->aclEntryN; |
| int i; |
| |
| for (i = 0; i < count; i++) |
| { |
| nfs4_ace_int_t *ace = &a->aclEntry[i]; |
| |
| if (!((ace->flags & ACE4_ID_SPECIAL) != 0 |
| && (ace->aceWho.special_whoid == ACE4_WHO_OWNER |
| || ace->aceWho.special_whoid == ACE4_WHO_GROUP |
| || ace->aceWho.special_whoid == ACE4_WHO_EVERYONE) |
| && ace->aceType == ACE4_ACCESS_ALLOWED_ACE_TYPE |
| && ace->aceFlags == 0 |
| && (ace->aceMask & ~(ACE4_READ_DATA | ACE4_LIST_DIRECTORY |
| | ACE4_WRITE_DATA | ACE4_ADD_FILE |
| | ACE4_EXECUTE)) == 0)) |
| return 1; |
| } |
| return 0; |
| # endif |
| } |
| |
| # endif |
| |
| #elif USE_ACL && HAVE_ACLSORT /* NonStop Kernel */ |
| |
| /* Test an ACL retrieved with ACL_GET. |
| Return 1 if the given ACL, consisting of COUNT entries, is non-trivial. |
| Return 0 if it is trivial, i.e. equivalent to a simple stat() mode. */ |
| int |
| acl_nontrivial (int count, struct acl *entries) |
| { |
| int i; |
| |
| for (i = 0; i < count; i++) |
| { |
| struct acl *ace = &entries[i]; |
| |
| /* Note: If ace->a_type = USER_OBJ, ace->a_id is the st_uid from stat(). |
| If ace->a_type = GROUP_OBJ, ace->a_id is the st_gid from stat(). |
| We don't need to check ace->a_id in these cases. */ |
| if (!(ace->a_type == USER_OBJ /* no need to check ace->a_id here */ |
| || ace->a_type == GROUP_OBJ /* no need to check ace->a_id here */ |
| || ace->a_type == CLASS_OBJ |
| || ace->a_type == OTHER_OBJ)) |
| return 1; |
| } |
| return 0; |
| } |
| |
| #endif |
| |
| void |
| free_permission_context (struct permission_context *ctx) |
| { |
| #if USE_ACL |
| # if HAVE_ACL_GET_FILE /* Linux, FreeBSD, Mac OS X, IRIX, Tru64, Cygwin >= 2.5 */ |
| if (ctx->acl) |
| acl_free (ctx->acl); |
| # if !HAVE_ACL_TYPE_EXTENDED |
| if (ctx->default_acl) |
| acl_free (ctx->default_acl); |
| # endif |
| |
| # elif defined GETACL /* Solaris, Cygwin < 2.5 */ |
| free (ctx->entries); |
| # ifdef ACE_GETACL |
| free (ctx->ace_entries); |
| # endif |
| |
| # elif HAVE_GETACL /* HP-UX */ |
| |
| # if HAVE_ACLV_H |
| # endif |
| |
| # elif HAVE_STATACL /* older AIX */ |
| |
| # elif HAVE_ACLSORT /* NonStop Kernel */ |
| |
| # endif |
| #endif |
| } |
