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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 20:46:53 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 20:46:53 +0000
commit19da58be2d9359a9641381feb559be0b918ef710 (patch)
tree109724175f07436696f51b14b5abbd3f4d704d6d /libmisc/chkname.c
parentInitial commit. (diff)
downloadshadow-19da58be2d9359a9641381feb559be0b918ef710.tar.xz
shadow-19da58be2d9359a9641381feb559be0b918ef710.zip
Adding upstream version 1:4.13+dfsg1.upstream/1%4.13+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'libmisc/chkname.c')
-rw-r--r--libmisc/chkname.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/libmisc/chkname.c b/libmisc/chkname.c
new file mode 100644
index 0000000..e31ee8c
--- /dev/null
+++ b/libmisc/chkname.c
@@ -0,0 +1,101 @@
+/*
+ * SPDX-FileCopyrightText: 1990 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2005 - 2008, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * is_valid_user_name(), is_valid_group_name() - check the new user/group
+ * name for validity;
+ * return values:
+ * true - OK
+ * false - bad name
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <ctype.h>
+#include "defines.h"
+#include "chkname.h"
+
+int allow_bad_names = false;
+
+static bool is_valid_name (const char *name)
+{
+ if (allow_bad_names) {
+ return true;
+ }
+
+ /*
+ * User/group names must match gnu e-regex:
+ * [a-zA-Z0-9_.][a-zA-Z0-9_.-]{0,30}[a-zA-Z0-9_.$-]?
+ *
+ * as a non-POSIX, extension, allow "$" as the last char for
+ * sake of Samba 3.x "add machine script"
+ *
+ * Also do not allow fully numeric names or just "." or "..".
+ */
+ int numeric;
+
+ if ('\0' == *name ||
+ ('.' == *name && (('.' == name[1] && '\0' == name[2]) ||
+ '\0' == name[1])) ||
+ !((*name >= 'a' && *name <= 'z') ||
+ (*name >= 'A' && *name <= 'Z') ||
+ (*name >= '0' && *name <= '9') ||
+ *name == '_' ||
+ *name == '.')) {
+ return false;
+ }
+
+ numeric = isdigit(*name);
+
+ while ('\0' != *++name) {
+ if (!((*name >= 'a' && *name <= 'z') ||
+ (*name >= 'A' && *name <= 'Z') ||
+ (*name >= '0' && *name <= '9') ||
+ *name == '_' ||
+ *name == '.' ||
+ *name == '-' ||
+ (*name == '$' && name[1] == '\0')
+ )) {
+ return false;
+ }
+ numeric &= isdigit(*name);
+ }
+
+ return !numeric;
+}
+
+bool is_valid_user_name (const char *name)
+{
+ /*
+ * User names are limited by whatever utmp can
+ * handle.
+ */
+ if (strlen (name) > USER_NAME_MAX_LENGTH) {
+ return false;
+ }
+
+ return is_valid_name (name);
+}
+
+bool is_valid_group_name (const char *name)
+{
+ /*
+ * Arbitrary limit for group names.
+ * HP-UX 10 limits to 16 characters
+ */
+ if ( (GROUP_NAME_MAX_LENGTH > 0)
+ && (strlen (name) > GROUP_NAME_MAX_LENGTH)) {
+ return false;
+ }
+
+ return is_valid_name (name);
+}
+