2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1990, 1993, 1994
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8 * modification, are permitted provided that the following conditions
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19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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32 #if defined(LIBC_SCCS) && !defined(lint)
33 static char sccsid[] = "@(#)pw_scan.c 8.3 (Berkeley) 4/2/94";
34 #endif /* LIBC_SCCS and not lint */
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
39 * This module is used to "verify" password entries by chpass(1) and
43 #include <sys/param.h>
57 * Some software assumes that IDs are short. We should emit warnings
58 * for id's which cannot be stored in a short, but we are more liberal
59 * by default, warning for IDs greater than USHRT_MAX.
61 * If pw_big_ids_warning is -1 on entry to pw_scan(), it will be set based
62 * on the existence of PW_SCAN_BIG_IDS in the environment.
64 * It is believed all baseline system software that can not handle the
65 * normal ID sizes is now gone so pw_big_ids_warning is disabled for now.
66 * But the code has been left in place in case end-users want to re-enable
67 * it and/or for the next time the ID sizes get bigger but pieces of the
70 static int pw_big_ids_warning = 0;
73 __pw_scan(char *bp, struct passwd *pw, int flags)
80 if (pw_big_ids_warning == -1)
81 pw_big_ids_warning = getenv("PW_SCAN_BIG_IDS") == NULL ? 1 : 0;
84 if (!(pw->pw_name = strsep(&bp, ":"))) /* login */
86 root = !strcmp(pw->pw_name, "root");
87 if (pw->pw_name[0] && (pw->pw_name[0] != '+' || pw->pw_name[1] == '\0'))
88 pw->pw_fields |= _PWF_NAME;
90 if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */
93 pw->pw_fields |= _PWF_PASSWD;
95 if (!(p = strsep(&bp, ":"))) /* uid */
98 pw->pw_fields |= _PWF_UID;
100 if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') {
101 if (flags & _PWSCAN_WARN)
102 warnx("no uid for user %s", pw->pw_name);
107 temp = strtoul(p, &ep, 10);
108 if ((temp == ULONG_MAX && errno == ERANGE) || temp > UID_MAX) {
109 if (flags & _PWSCAN_WARN)
110 warnx("%s > max uid value (%u)", p, UID_MAX);
115 if (flags & _PWSCAN_WARN)
116 warnx("%s uid is incorrect", p);
120 if (flags & _PWSCAN_WARN)
121 warnx("root uid should be 0");
124 if (flags & _PWSCAN_WARN && pw_big_ids_warning && id > USHRT_MAX) {
125 warnx("%s > recommended max uid value (%u)", p, USHRT_MAX);
126 /*return (0);*/ /* THIS SHOULD NOT BE FATAL! */
130 if (!(p = strsep(&bp, ":"))) /* gid */
133 pw->pw_fields |= _PWF_GID;
135 if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') {
136 if (flags & _PWSCAN_WARN)
137 warnx("no gid for user %s", pw->pw_name);
142 temp = strtoul(p, &ep, 10);
143 if ((temp == ULONG_MAX && errno == ERANGE) || temp > GID_MAX) {
144 if (flags & _PWSCAN_WARN)
145 warnx("%s > max gid value (%u)", p, GID_MAX);
150 if (flags & _PWSCAN_WARN)
151 warnx("%s gid is incorrect", p);
154 if (flags & _PWSCAN_WARN && pw_big_ids_warning && id > USHRT_MAX) {
155 warnx("%s > recommended max gid value (%u)", p, USHRT_MAX);
156 /* return (0); This should not be fatal! */
160 if (flags & _PWSCAN_MASTER ) {
161 if (!(pw->pw_class = strsep(&bp, ":"))) /* class */
164 pw->pw_fields |= _PWF_CLASS;
166 if (!(p = strsep(&bp, ":"))) /* change */
169 pw->pw_fields |= _PWF_CHANGE;
170 pw->pw_change = atol(p);
172 if (!(p = strsep(&bp, ":"))) /* expire */
175 pw->pw_fields |= _PWF_EXPIRE;
176 pw->pw_expire = atol(p);
178 if (!(pw->pw_gecos = strsep(&bp, ":"))) /* gecos */
181 pw->pw_fields |= _PWF_GECOS;
183 if (!(pw->pw_dir = strsep(&bp, ":"))) /* directory */
186 pw->pw_fields |= _PWF_DIR;
188 if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */
192 if (root && *p) { /* empty == /bin/sh */
193 for (setusershell();;) {
194 if (!(sh = getusershell())) {
195 if (flags & _PWSCAN_WARN)
196 warnx("warning, unknown root shell");
205 pw->pw_fields |= _PWF_SHELL;
207 if ((p = strsep(&bp, ":"))) { /* too many */
209 if (flags & _PWSCAN_WARN)
210 warnx("corrupted entry");