diff options
Diffstat (limited to 'pw/libutil/pw_scan.c')
| -rw-r--r-- | pw/libutil/pw_scan.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/pw/libutil/pw_scan.c b/pw/libutil/pw_scan.c new file mode 100644 index 0000000..f680a90 --- /dev/null +++ b/pw/libutil/pw_scan.c @@ -0,0 +1,207 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 1990, 1993, 1994 + * The Regents of the University of California. 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. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS OR CONTRIBUTORS 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. + */ + +#include <sys/cdefs.h> +__SCCSID("@(#)pw_scan.c 8.3 (Berkeley) 4/2/94"); +__FBSDID("$FreeBSD$"); + +/* + * This module is used to "verify" password entries by chpass(1) and + * pwd_mkdb(8). + */ + +#include <sys/param.h> + +#include <err.h> +#include <errno.h> +#include <pwd.h> +#include <string.h> +#include <stdlib.h> +#include <unistd.h> + +#include "pw_scan.h" + +/* + * Some software assumes that IDs are short. We should emit warnings + * for id's which cannot be stored in a short, but we are more liberal + * by default, warning for IDs greater than USHRT_MAX. + * + * If pw_big_ids_warning is -1 on entry to pw_scan(), it will be set based + * on the existence of PW_SCAN_BIG_IDS in the environment. + * + * It is believed all baseline system software that can not handle the + * normal ID sizes is now gone so pw_big_ids_warning is disabled for now. + * But the code has been left in place in case end-users want to re-enable + * it and/or for the next time the ID sizes get bigger but pieces of the + * system lag behind. + */ +static int pw_big_ids_warning = 0; + +void +__pw_initpwd(struct passwd *pwd) +{ + static char nul[] = ""; + + memset(pwd, 0, sizeof(*pwd)); + pwd->pw_uid = (uid_t)-1; /* Considered least likely to lead to */ + pwd->pw_gid = (gid_t)-1; /* a security issue. */ + pwd->pw_name = nul; + pwd->pw_passwd = nul; + pwd->pw_class = nul; + pwd->pw_gecos = nul; + pwd->pw_dir = nul; + pwd->pw_shell = nul; +} + +int +__pw_scan(char *bp, struct passwd *pw, int flags) +{ + uid_t id; + int root; + char *ep, *p, *sh; + unsigned long temp; + + if (pw_big_ids_warning == -1) + pw_big_ids_warning = getenv("PW_SCAN_BIG_IDS") == NULL ? 1 : 0; + + if (!(pw->pw_name = strsep(&bp, ":"))) /* login */ + goto fmt; + root = !strcmp(pw->pw_name, "root"); + + if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */ + goto fmt; + + if (!(p = strsep(&bp, ":"))) /* uid */ + goto fmt; + if (p[0]) { + } else { + if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') { + if (flags & _PWSCAN_WARN) + warnx("no uid for user %s", pw->pw_name); + return (0); + } + } + errno = 0; + temp = strtoul(p, &ep, 10); + if ((temp == ULONG_MAX && errno == ERANGE) || temp > UID_MAX) { + if (flags & _PWSCAN_WARN) + warnx("%s > max uid value (%u)", p, UID_MAX); + return (0); + } + id = temp; + if (*ep != '\0') { + if (flags & _PWSCAN_WARN) + warnx("%s uid is incorrect", p); + return (0); + } + if (root && id) { + if (flags & _PWSCAN_WARN) + warnx("root uid should be 0"); + return (0); + } + if (flags & _PWSCAN_WARN && pw_big_ids_warning && id > USHRT_MAX) { + warnx("%s > recommended max uid value (%u)", p, USHRT_MAX); + /*return (0);*/ /* THIS SHOULD NOT BE FATAL! */ + } + pw->pw_uid = id; + + if (!(p = strsep(&bp, ":"))) /* gid */ + goto fmt; + if (p[0]) { + } else { + if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') { + if (flags & _PWSCAN_WARN) + warnx("no gid for user %s", pw->pw_name); + return (0); + } + } + errno = 0; + temp = strtoul(p, &ep, 10); + if ((temp == ULONG_MAX && errno == ERANGE) || temp > GID_MAX) { + if (flags & _PWSCAN_WARN) + warnx("%s > max gid value (%u)", p, GID_MAX); + return (0); + } + id = temp; + if (*ep != '\0') { + if (flags & _PWSCAN_WARN) + warnx("%s gid is incorrect", p); + return (0); + } + if (flags & _PWSCAN_WARN && pw_big_ids_warning && id > USHRT_MAX) { + warnx("%s > recommended max gid value (%u)", p, USHRT_MAX); + /* return (0); This should not be fatal! */ + } + pw->pw_gid = id; + + if (flags & _PWSCAN_MASTER ) { + if (!(pw->pw_class = strsep(&bp, ":"))) /* class */ + goto fmt; + + if (!(p = strsep(&bp, ":"))) /* change */ + goto fmt; + pw->pw_change = atol(p); + + if (!(p = strsep(&bp, ":"))) /* expire */ + goto fmt; + pw->pw_expire = atol(p); + } + if (!(pw->pw_gecos = strsep(&bp, ":"))) /* gecos */ + goto fmt; + + if (!(pw->pw_dir = strsep(&bp, ":"))) /* directory */ + goto fmt; + + if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */ + goto fmt; + + p = pw->pw_shell; + if (root && *p) { /* empty == /bin/sh */ + for (setusershell();;) { + if (!(sh = getusershell())) { + if (flags & _PWSCAN_WARN) + warnx("warning, unknown root shell"); + break; + } + if (!strcmp(p, sh)) + break; + } + endusershell(); + } + + if ((p = strsep(&bp, ":"))) { /* too many */ +fmt: + if (flags & _PWSCAN_WARN) + warnx("corrupted entry"); + return (0); + } + return (1); +} |