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+/* Test whether a file has a nontrivial ACL. -*- coding: utf-8 -*-
+
+ Copyright (C) 2002-2003, 2005-2022 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
+}
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