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302 lines
7.4 KiB
C
302 lines
7.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Copyright 1989 - 1994, Julianne Frances Haugh
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* <jockgrrl@austin.rr.com>, <jfh@austin.ibm.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* TODO: fgetspent_r.c getspent_r.c getspnam_r.c sgetspent_r.c
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* lckpwdf ulckpwdf
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "busybox.h"
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#include "shadow_.h"
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static FILE *shadow;
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static char spwbuf[BUFSIZ];
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static struct spwd spwd;
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#define FIELDS 9
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#define OFIELDS 5
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/* setspent - initialize access to shadow text and DBM files */
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void setspent(void)
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{
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if (shadow) {
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rewind(shadow);
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} else {
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if ((shadow = fopen("/etc/shadow", "r")) == NULL)
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perror_msg_and_die("/etc/shadow");
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}
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}
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/* endspent - terminate access to shadow text and DBM files */
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void endspent(void)
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{
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if (shadow)
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(void) fclose(shadow);
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shadow = (FILE *) 0;
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}
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/* getspent - get a (struct spwd *) from the current shadow file */
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struct spwd *getspent(void)
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{
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if (!shadow)
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setspent();
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return (fgetspent(shadow));
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}
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/* getspnam - get a shadow entry by name */
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struct spwd *getspnam(const char *name)
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{
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struct spwd *sp;
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if (!name || !strlen(name))
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return NULL;
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setspent();
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while ((sp = getspent()) != NULL) {
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if (strcmp(name, sp->sp_namp) == 0)
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break;
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}
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endspent();
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return (sp);
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}
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/* sgetspent - convert string in shadow file format to (struct spwd *) */
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/* returns NULL on error */
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struct spwd *sgetspent(const char *string)
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{
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char *fields[FIELDS];
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char *cp;
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char *cpp;
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int i;
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/*
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* Copy string to local buffer. It has to be tokenized and we
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* have to do that to our private copy.
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*/
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if (strlen(string) >= sizeof spwbuf)
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/* return 0; */
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return NULL;
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strcpy(spwbuf, string);
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if ((cp = strrchr(spwbuf, '\n')))
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*cp = '\0';
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/*
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* Tokenize the string into colon separated fields. Allow up to
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* FIELDS different fields.
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*/
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for (cp = spwbuf, i = 0; *cp && i < FIELDS; i++) {
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fields[i] = cp;
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while (*cp && *cp != ':')
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cp++;
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if (*cp)
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*cp++ = '\0';
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}
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/*
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* It is acceptable for the last SVR4 field to be blank. This
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* results in the loop being terminated early. In which case,
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* we just make the last field be blank and be done with it.
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*/
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if (i == (FIELDS - 1))
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fields[i++] = cp;
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if ((cp && *cp) || (i != FIELDS && i != OFIELDS))
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/* return 0; */
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return NULL;
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/*
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* Start populating the structure. The fields are all in
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* static storage, as is the structure we pass back. If we
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* ever see a name with '+' as the first character, we try
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* to turn on NIS processing.
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*/
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spwd.sp_namp = fields[0];
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spwd.sp_pwdp = fields[1];
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/*
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* Get the last changed date. For all of the integer fields,
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* we check for proper format. It is an error to have an
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* incorrectly formatted number, unless we are using NIS.
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*/
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if ((spwd.sp_lstchg = strtol(fields[2], &cpp, 10)) == 0 && *cpp) {
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/* return 0; */
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return NULL;
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} else if (fields[2][0] == '\0')
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spwd.sp_lstchg = -1;
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/*
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* Get the minimum period between password changes.
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*/
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if ((spwd.sp_min = strtol(fields[3], &cpp, 10)) == 0 && *cpp) {
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/* return 0; */
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return NULL;
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} else if (fields[3][0] == '\0')
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spwd.sp_min = -1;
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/*
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* Get the maximum number of days a password is valid.
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*/
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if ((spwd.sp_max = strtol(fields[4], &cpp, 10)) == 0 && *cpp) {
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/* return 0; */
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return NULL;
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} else if (fields[4][0] == '\0')
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spwd.sp_max = -1;
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/*
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* If there are only OFIELDS fields (this is a SVR3.2 /etc/shadow
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* formatted file), initialize the other field members to -1.
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*/
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if (i == OFIELDS) {
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spwd.sp_warn = spwd.sp_inact = spwd.sp_expire = spwd.sp_flag = -1;
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return &spwd;
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}
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/*
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* The rest of the fields are mandatory for SVR4, but optional
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* for anything else. However, if one is present the others
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* must be as well.
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*/
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/*
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* Get the number of days of password expiry warning.
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*/
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if ((spwd.sp_warn = strtol(fields[5], &cpp, 10)) == 0 && *cpp) {
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/* return 0; */
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return NULL;
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} else if (fields[5][0] == '\0')
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spwd.sp_warn = -1;
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/*
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* Get the number of days of inactivity before an account is
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* disabled.
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*/
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if ((spwd.sp_inact = strtol(fields[6], &cpp, 10)) == 0 && *cpp) {
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/* return 0; */
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return NULL;
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} else if (fields[6][0] == '\0')
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spwd.sp_inact = -1;
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/*
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* Get the number of days after the epoch before the account is
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* set to expire.
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*/
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if ((spwd.sp_expire = strtol(fields[7], &cpp, 10)) == 0 && *cpp) {
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/* return 0; */
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return NULL;
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} else if (fields[7][0] == '\0')
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spwd.sp_expire = -1;
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/*
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* This field is reserved for future use. But it isn't supposed
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* to have anything other than a valid integer in it.
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*/
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if ((spwd.sp_flag = strtol(fields[8], &cpp, 10)) == 0 && *cpp) {
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/* return 0; */
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return NULL;
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} else if (fields[8][0] == '\0')
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spwd.sp_flag = -1;
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return (&spwd);
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}
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/* fgetspent - get an entry from an /etc/shadow formatted stream */
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struct spwd *fgetspent(FILE *fp)
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{
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char buf[BUFSIZ];
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char *cp;
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if (!fp)
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/* return (0); */
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return NULL;
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if (fgets(buf, sizeof buf, fp) != (char *) 0) {
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if ((cp = strchr(buf, '\n')))
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*cp = '\0';
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return (sgetspent(buf));
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}
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/* return 0; */
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return NULL;
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}
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/*
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* putspent - put a (struct spwd *) into the (FILE *) you provide.
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*
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* this was described in shadow_.h but not implemented, so here
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* I go. -beppu
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*
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*/
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int putspent(const struct spwd *sp, FILE *fp)
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{
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int ret;
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/* seek to end */
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ret = fseek(fp, 0, SEEK_END);
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if (ret == -1) {
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/* return -1; */
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return 1;
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}
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/* powered by fprintf */
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fprintf(fp, "%s:%s:%ld:%ld:%ld:%ld:%ld:%ld:%s\n", sp->sp_namp, /* login name */
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sp->sp_pwdp, /* encrypted password */
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sp->sp_lstchg, /* date of last change */
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sp->sp_min, /* minimum number of days between changes */
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sp->sp_max, /* maximum number of days between changes */
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sp->sp_warn, /* number of days of warning before password expires */
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sp->sp_inact, /* number of days after password expires until
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the account becomes unusable */
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sp->sp_expire, /* days since 1/1/70 until account expires */
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"");
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return 0;
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}
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