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/*
* SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
* SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
* SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
* SPDX-FileCopyrightText: 2009 , Nicolas François
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <config.h>
/* Newer versions of Linux libc already have shadow support. */
#ifndef HAVE_GETSPNAM
#ident "$Id$"
#include <sys/types.h>
#include "prototypes.h"
#include "defines.h"
#include <stdio.h>
#include "atoi/str2i.h"
static FILE *shadow;
#define FIELDS 9
#define OFIELDS 5
/*
* setspent - initialize access to shadow text and DBM files
*/
void setspent (void)
{
if (NULL != shadow) {
rewind (shadow);
}else {
shadow = fopen (SHADOW_FILE, "r");
}
}
/*
* endspent - terminate access to shadow text and DBM files
*/
void endspent (void)
{
if (NULL != shadow) {
(void) fclose (shadow);
}
shadow = NULL;
}
/*
* my_sgetspent - convert string in shadow file format to (struct spwd *)
*/
static struct spwd *my_sgetspent (const char *string)
{
static char spwbuf[BUFSIZ];
static struct spwd spwd;
char *fields[FIELDS];
char *cp;
int i;
/*
* Copy string to local buffer. It has to be tokenized and we
* have to do that to our private copy.
*/
if (strlen (string) >= sizeof spwbuf)
return 0;
strcpy (spwbuf, string);
cp = strrchr (spwbuf, '\n');
if (NULL != cp)
*cp = '\0';
/*
* Tokenize the string into colon separated fields. Allow up to
* FIELDS different fields.
*/
for (cp = spwbuf, i = 0; *cp && i < FIELDS; i++) {
fields[i] = cp;
while (*cp && *cp != ':')
cp++;
if (*cp)
*cp++ = '\0';
}
if (i == (FIELDS - 1))
fields[i++] = cp;
if ((cp && *cp) || (i != FIELDS && i != OFIELDS))
return 0;
/*
* Start populating the structure. The fields are all in
* static storage, as is the structure we pass back. If we
* ever see a name with '+' as the first character, we try
* to turn on NIS processing.
*/
spwd.sp_namp = fields[0];
spwd.sp_pwdp = fields[1];
/*
* Get the last changed date. For all of the integer fields,
* we check for proper format. It is an error to have an
* incorrectly formatted number, unless we are using NIS.
*/
if (fields[2][0] == '\0') {
spwd.sp_lstchg = -1;
} else {
if (str2sl(&spwd.sp_lstchg, fields[2]) == -1)
return 0;
if (spwd.sp_lstchg < 0)
return 0;
}
/*
* Get the minimum period between password changes.
*/
if (fields[3][0] == '\0') {
spwd.sp_min = -1;
} else {
if (str2sl(&spwd.sp_min, fields[3]) == -1)
return 0;
if (spwd.sp_min < 0)
return 0;
}
/*
* Get the maximum number of days a password is valid.
*/
if (fields[4][0] == '\0') {
spwd.sp_max = -1;
} else {
if (str2sl(&spwd.sp_max, fields[4]) == -1)
return 0;
if (spwd.sp_max < 0)
return 0;
}
/*
* If there are only OFIELDS fields (this is a SVR3.2 /etc/shadow
* formatted file), initialize the other field members to -1.
*/
if (i == OFIELDS) {
spwd.sp_warn = -1;
spwd.sp_inact = -1;
spwd.sp_expire = -1;
spwd.sp_flag = SHADOW_SP_FLAG_UNSET;
return &spwd;
}
/*
* Get the number of days of password expiry warning.
*/
if (fields[5][0] == '\0') {
spwd.sp_warn = -1;
} else {
if (str2sl(&spwd.sp_warn, fields[5]) == -1)
return 0;
if (spwd.sp_warn < 0)
return 0;
}
/*
* Get the number of days of inactivity before an account is
* disabled.
*/
if (fields[6][0] == '\0') {
spwd.sp_inact = -1;
} else {
if (str2sl(&spwd.sp_inact, fields[6]) == -1)
return 0;
if (spwd.sp_inact < 0)
return 0;
}
/*
* Get the number of days after the epoch before the account is
* set to expire.
*/
if (fields[7][0] == '\0') {
spwd.sp_expire = -1;
} else {
if (str2sl(&spwd.sp_expire, fields[7]) == -1)
return 0;
if (spwd.sp_expire < 0)
return 0;
}
/*
* This field is reserved for future use. But it isn't supposed
* to have anything other than a valid integer in it.
*/
if (fields[8][0] == '\0') {
spwd.sp_flag = SHADOW_SP_FLAG_UNSET;
} else {
if (str2ul(&spwd.sp_flag, fields[8]) == -1)
return 0;
if (spwd.sp_flag < 0)
return 0;
}
return (&spwd);
}
/*
* fgetspent - get an entry from a /etc/shadow formatted stream
*/
struct spwd *fgetspent (FILE * fp)
{
char buf[BUFSIZ];
char *cp;
if (NULL == fp) {
return (0);
}
if (fgets (buf, sizeof buf, fp) != NULL)
{
cp = strchr (buf, '\n');
if (NULL != cp) {
*cp = '\0';
}
return my_sgetspent (buf);
}
return 0;
}
/*
* getspent - get a (struct spwd *) from the current shadow file
*/
struct spwd *getspent (void)
{
if (NULL == shadow) {
setspent ();
}
return (fgetspent (shadow));
}
/*
* getspnam - get a shadow entry by name
*/
struct spwd *getspnam (const char *name)
{
struct spwd *sp;
setspent ();
while ((sp = getspent ()) != NULL) {
if (strcmp (name, sp->sp_namp) == 0) {
break;
}
}
endspent ();
return (sp);
}
#else
extern int ISO_C_forbids_an_empty_translation_unit;
#endif
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