147 lines
2.7 KiB
C
147 lines
2.7 KiB
C
// SPDX-FileCopyrightText: 1990-1994, Julianne Frances Haugh
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// SPDX-FileCopyrightText: 1996-2000, Marek Michałkiewicz
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// SPDX-FileCopyrightText: 2001-2005, Tomasz Kłoczko
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// SPDX-FileCopyrightText: 2005-2008, Nicolas François
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// SPDX-FileCopyrightText: 2023-2025, Alejandro Colomar <alx@kernel.org>
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// SPDX-License-Identifier: BSD-3-Clause
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/*
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* is_valid_user_name(), is_valid_group_name() - check the new user/group
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* name for validity;
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* return values:
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* true - OK
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* false - bad name
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* errors:
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* EINVAL Invalid name
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* EILSEQ Invalid name character sequence (acceptable with --badname)
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* EOVERFLOW Name longer than maximum size
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*/
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#include "config.h"
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#ident "$Id$"
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#include <ctype.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <string.h>
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#include <unistd.h>
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#include "defines.h"
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#include "chkname.h"
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#include "string/ctype/strchrisascii/strchriscntrl.h"
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#include "string/ctype/strisascii/strisdigit.h"
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#include "string/strcmp/streq.h"
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#include "string/strcmp/strcaseeq.h"
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#ifndef LOGIN_NAME_MAX
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# define LOGIN_NAME_MAX 256
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#endif
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int allow_bad_names = false;
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size_t
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login_name_max_size(void)
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{
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long conf;
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conf = sysconf(_SC_LOGIN_NAME_MAX);
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if (conf == -1)
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return LOGIN_NAME_MAX;
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return conf;
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}
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static bool
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is_valid_name(const char *name)
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{
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if (streq(name, "")
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|| streq(name, ".")
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|| streq(name, "..")
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|| strspn(name, "-")
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|| strpbrk(name, " \"#',/:;")
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|| strchriscntrl(name)
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|| strisdigit(name))
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{
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errno = EINVAL;
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return false;
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}
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if (allow_bad_names) {
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return true;
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}
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/*
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* User/group names must match BRE regex:
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* [a-zA-Z0-9_.][a-zA-Z0-9_.-]*$\?
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*
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* as a non-POSIX, extension, allow "$" as the last char for
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* sake of Samba 3.x "add machine script"
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*/
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if (!((*name >= 'a' && *name <= 'z') ||
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(*name >= 'A' && *name <= 'Z') ||
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(*name >= '0' && *name <= '9') ||
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*name == '_' ||
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*name == '.'))
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{
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errno = EILSEQ;
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return false;
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}
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while (!streq(++name, "")) {
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if (!((*name >= 'a' && *name <= 'z') ||
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(*name >= 'A' && *name <= 'Z') ||
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(*name >= '0' && *name <= '9') ||
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*name == '_' ||
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*name == '.' ||
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*name == '-' ||
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streq(name, "$")
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))
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{
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errno = EILSEQ;
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return false;
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}
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}
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return true;
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}
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bool
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is_valid_user_name(const char *name)
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{
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if (strlen(name) >= login_name_max_size()) {
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errno = EOVERFLOW;
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return false;
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}
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return is_valid_name(name);
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}
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bool
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is_valid_group_name(const char *name)
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{
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/*
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* Arbitrary limit for group names.
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* HP-UX 10 limits to 16 characters
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*/
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if ( (GROUP_NAME_MAX_LENGTH > 0)
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&& (strlen (name) > GROUP_NAME_MAX_LENGTH))
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{
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errno = EOVERFLOW;
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return false;
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}
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return is_valid_name (name);
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}
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