o POSIX.2c Userland tool support for POSIX.1e ACLs -- getfacl retrieves ACLs

  from files and directories, and setfacl sets ACLs on files and directories.

Submitted by:	jedgar
Obtained from:	TrustedBSD Project

1 files changed, 155 insertions, 0 deletions

diff --git a/bin/setfacl/remove.c b/bin/setfacl/remove.c
new file mode 100644
index 0000000..0fe02d1
--- /dev/null
+++ b/bin/setfacl/remove.c
@@ -0,0 +1,155 @@
+/*
+ * Copyright (c) 2001 Chris D. Faulhaber
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR THE VOICES IN HIS HEAD BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <sys/acl.h>
+#include <sys/stat.h>
+
+#include <err.h>
+#include <stdio.h>
+#include <string.h>
+#include <sysexits.h>
+
+#include "setfacl.h"
+
+/* remove ACL entries from an ACL */
+int
+remove_acl(acl_t acl, acl_t *prev_acl)
+{
+	acl_t acl_new;
+	int carried_error, i;
+
+	carried_error = 0;
+
+	if (acl_type == ACL_TYPE_ACCESS)
+		acl_new = acl_dup(prev_acl[0]);
+	else
+		acl_new = acl_dup(prev_acl[1]);
+	if (!acl_new)
+		err(EX_OSERR, "acl_dup() failed");
+
+	/* find and delete the entry */
+	for (i = 0; i < acl->acl_cnt; i++) {
+		if (acl->acl_entry[i].ae_tag == ACL_MASK)
+			have_mask++;
+		if (acl_delete_entry(acl_new, &acl->acl_entry[i]) == -1) {
+			carried_error++;
+			warnx("cannot remove non-existent acl entry");
+		}
+	}
+
+	if (acl_type == ACL_TYPE_ACCESS) {
+		acl_free(prev_acl[0]);
+		prev_acl[0] = acl_new;
+	} else {
+		acl_free(prev_acl[1]);
+		prev_acl[1] = acl_new;
+	}
+
+	if (carried_error)
+		return -1;
+
+	return 0;
+}
+
+/* remove default entries */
+int
+remove_default(acl_t *prev_acl)
+{
+
+	if (prev_acl[1]) {
+		bzero(prev_acl[1], sizeof(struct acl));
+		prev_acl[1]->acl_cnt = 0;
+	} else {
+		warn("cannot remove default ACL");
+		return -1;
+	}
+	return 0;
+}
+
+/* remove extended entries */
+void
+remove_ext(acl_t *prev_acl)
+{
+	acl_t acl_new, acl_old;
+	acl_perm_t group_perm, mask_perm;
+	int have_mask_entry, i;
+
+	if (acl_type == ACL_TYPE_ACCESS)
+		acl_old = acl_dup(prev_acl[0]);
+	else
+		acl_old = acl_dup(prev_acl[1]);
+	if (!acl_old)
+		err(EX_OSERR, "acl_dup() failed");
+
+	group_perm = mask_perm = 0;
+	have_mask_entry = 0;
+	acl_new = acl_init(ACL_MAX_ENTRIES);
+	if (!acl_new)
+		err(EX_OSERR, "%s", "acl_init() failed");
+
+	/* only save the default user/group/other entries */
+	for (i = 0; i < acl_old->acl_cnt; i++)
+		switch(acl_old->acl_entry[i].ae_tag) {
+		case ACL_USER_OBJ:
+			acl_new->acl_entry[0] = acl_old->acl_entry[i];
+			break;
+		case ACL_GROUP_OBJ:
+			acl_new->acl_entry[1] = acl_old->acl_entry[i];
+			group_perm = acl_old->acl_entry[i].ae_perm;
+			break;
+		case ACL_OTHER_OBJ:
+			acl_new->acl_entry[2] = acl_old->acl_entry[i];
+			break;
+		case ACL_MASK:
+			mask_perm = acl_old->acl_entry[i].ae_perm;
+			have_mask_entry = 1;
+			break;
+		default:
+			break;
+		}
+	/*
+	 * If the ACL contains a mask entry, then the permissions associated
+	 * with the owning group entry in the resulting ACL shall be set to
+	 * only those permissions associated with both the owning group entry
+	 * and the mask entry of the current ACL.
+	 */
+	if (have_mask_entry)
+		acl_new->acl_entry[1].ae_perm = group_perm & mask_perm;
+	acl_new->acl_cnt = 3;
+
+	if (acl_type == ACL_TYPE_ACCESS) {
+		acl_free(prev_acl[0]);
+		prev_acl[0] = acl_new;
+	} else {
+		acl_free(prev_acl[1]);
+		prev_acl[1] = acl_new;
+	}
+
+	have_mask = 0;
+}