573 lines
14 KiB
C
573 lines
14 KiB
C
/*-
|
|
* Copyright (c) 1996 by
|
|
* Sean Eric Fagan <sef@kithrup.com>
|
|
* David Nugent <davidn@blaze.net.au>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, is permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice immediately at the beginning of the file, without modification,
|
|
* 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. This work was done expressly for inclusion into FreeBSD. Other use
|
|
* is permitted provided this notation is included.
|
|
* 4. Absolutely no warranty of function or purpose is made by the authors.
|
|
* 5. Modifications may be freely made to this file providing the above
|
|
* conditions are met.
|
|
*
|
|
* Low-level routines relating to the user capabilities database
|
|
*
|
|
* $Id: login_cap.c,v 1.10 1997/02/22 15:08:20 peter Exp $
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
#include <sys/resource.h>
|
|
#include <sys/param.h>
|
|
#include <pwd.h>
|
|
#include <login_cap.h>
|
|
|
|
#ifdef RLIM_LONG
|
|
# define STRTOV strtol
|
|
#else
|
|
# define STRTOV strtoq
|
|
#endif
|
|
|
|
static int lc_object_count = 0;
|
|
|
|
static size_t internal_stringsz = 0;
|
|
static char * internal_string = NULL;
|
|
static size_t internal_arraysz = 0;
|
|
static char ** internal_array = NULL;
|
|
|
|
static char *
|
|
allocstr(char * str)
|
|
{
|
|
char * p;
|
|
size_t sz = strlen(str) + 1; /* realloc() only if necessary */
|
|
if (sz <= internal_stringsz)
|
|
p = strcpy(internal_string, str);
|
|
else if ((p = realloc(internal_string, sz)) != NULL) {
|
|
internal_stringsz = sz;
|
|
internal_string = strcpy(p, str);
|
|
}
|
|
return p;
|
|
}
|
|
|
|
static char **
|
|
allocarray(size_t sz)
|
|
{
|
|
char ** p;
|
|
if (sz <= internal_arraysz)
|
|
p = internal_array;
|
|
else if ((p = realloc(internal_array, sz * sizeof(char*))) != NULL) {
|
|
internal_arraysz = sz;
|
|
internal_array = p;
|
|
}
|
|
return p;
|
|
}
|
|
|
|
|
|
/*
|
|
* arrayize()
|
|
* Turn a simple string <str> seperated by any of
|
|
* the set of <chars> into an array. The last element
|
|
* of the array will be NULL, as is proper.
|
|
* Free using freearraystr()
|
|
*/
|
|
|
|
static char **
|
|
arrayize(char *str, const char *chars, int *size)
|
|
{
|
|
int i;
|
|
char *ptr;
|
|
char **res = NULL;
|
|
|
|
for (i = 0, ptr = str; *ptr; i++) {
|
|
int count = strcspn(ptr, chars);
|
|
ptr += count;
|
|
if (*ptr)
|
|
++ptr;
|
|
}
|
|
|
|
if ((ptr = allocstr(str)) == NULL) {
|
|
res = NULL;
|
|
i = 0;
|
|
} else if ((res = allocarray(++i)) == NULL) {
|
|
free(str);
|
|
i = 0;
|
|
} else {
|
|
for (i = 0; *ptr; i++) {
|
|
int count = strcspn(ptr, chars);
|
|
res[i] = ptr;
|
|
ptr += count;
|
|
if (*ptr)
|
|
*ptr++ = '\0';
|
|
}
|
|
res[i] = 0;
|
|
}
|
|
if (size)
|
|
*size = i;
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* login_close()
|
|
* Frees up all resources relating to a login class
|
|
*
|
|
*/
|
|
|
|
void
|
|
login_close(login_cap_t * lc)
|
|
{
|
|
if (lc) {
|
|
free(lc->lc_style);
|
|
free(lc->lc_class);
|
|
free(lc);
|
|
if (--lc_object_count == 0) {
|
|
free(internal_string);
|
|
free(internal_array);
|
|
internal_array = NULL;
|
|
internal_arraysz = 0;
|
|
internal_string = NULL;
|
|
internal_stringsz = 0;
|
|
cgetclose();
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* login_getclassbyname() get the login class by its name.
|
|
* If the name given is NULL or empty, the default class
|
|
* LOGIN_DEFCLASS (ie. "default") is fetched. If the
|
|
* 'dir' argument contains a non-NULL non-empty string,
|
|
* then the file _FILE_LOGIN_CONF is picked up from that
|
|
* directory instead of the system login database.
|
|
* Return a filled-out login_cap_t structure, including
|
|
* class name, and the capability record buffer.
|
|
*/
|
|
|
|
login_cap_t *
|
|
login_getclassbyname(char const * name, char const * dir)
|
|
{
|
|
login_cap_t *lc = malloc(sizeof(login_cap_t));
|
|
|
|
if (lc != NULL) {
|
|
int i = 0;
|
|
char userpath[MAXPATHLEN];
|
|
static char *login_dbarray[] = { NULL, NULL, NULL };
|
|
|
|
if (dir && snprintf(userpath, MAXPATHLEN, "%s/%s", dir, _FILE_LOGIN_CONF) < MAXPATHLEN)
|
|
login_dbarray[i++] = userpath;
|
|
else
|
|
login_dbarray[i++] = _PATH_LOGIN_CONF;
|
|
login_dbarray[i ] = NULL;
|
|
|
|
lc->lc_cap = lc->lc_class = lc->lc_style = NULL;
|
|
|
|
if ((name == NULL || cgetent(&lc->lc_cap, login_dbarray, (char*)name) != 0) &&
|
|
cgetent(&lc->lc_cap, login_dbarray, (char*)(name = LOGIN_DEFCLASS)) != 0) {
|
|
free(lc);
|
|
lc = NULL;
|
|
} else {
|
|
++lc_object_count;
|
|
lc->lc_class = strdup(name);
|
|
}
|
|
}
|
|
|
|
return lc;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* login_getclass()
|
|
* Get the login class for a given password entry from
|
|
* the system (only) login class database.
|
|
* If the password entry's class field is not set, or
|
|
* the class specified does not exist, then use the
|
|
* default of LOGIN_DEFCLASS (ie. "default").
|
|
* Return a filled-out login_cap_t structure, including
|
|
* class name, and the capability record buffer.
|
|
*/
|
|
|
|
login_cap_t *
|
|
login_getclass(const struct passwd *pwd)
|
|
{
|
|
const char * class = NULL;
|
|
if (pwd != NULL) {
|
|
if ((class = pwd->pw_class) == NULL || *class == '\0')
|
|
class = (pwd->pw_uid == 0) ? "root" : NULL;
|
|
}
|
|
return login_getclassbyname(class, 0);
|
|
}
|
|
|
|
|
|
/*
|
|
* login_getuserclass()
|
|
* Get the login class for a given password entry, allowing user
|
|
* overrides via ~/.login_conf.
|
|
* ### WAS: If the password entry's class field is not set,
|
|
* ####### or the class specified does not exist, then use
|
|
* If an entry with the recordid "me" does not exist, then use
|
|
* the default of LOGIN_DEFCLASS (ie. "default").
|
|
* Return a filled-out login_cap_t structure, including
|
|
* class name, and the capability record buffer.
|
|
*/
|
|
|
|
login_cap_t *
|
|
login_getuserclass(const struct passwd *pwd)
|
|
{
|
|
const char * class = "me"; /* (pwd == NULL) ? NULL : pwd->pw_class; */
|
|
const char * home = (pwd == NULL) ? NULL : pwd->pw_dir;
|
|
return login_getclassbyname(class, home);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* login_getcapstr()
|
|
* Given a login_cap entry, and a capability name, return the
|
|
* value defined for that capability, a defualt if not found, or
|
|
* an error string on error.
|
|
*/
|
|
|
|
char *
|
|
login_getcapstr(login_cap_t *lc, const char *cap, char *def, char *error)
|
|
{
|
|
char *res;
|
|
int ret;
|
|
|
|
if (lc == NULL || cap == NULL || lc->lc_cap == NULL || *cap == '\0')
|
|
return def;
|
|
|
|
if ((ret = cgetstr(lc->lc_cap, (char *)cap, &res)) == -1) {
|
|
return def;
|
|
} else if (ret >= 0)
|
|
return res;
|
|
else
|
|
return error;
|
|
}
|
|
|
|
|
|
/*
|
|
* login_getcaplist()
|
|
* Given a login_cap entry, and a capability name, return the
|
|
* value defined for that capability split into an array of
|
|
* strings.
|
|
*/
|
|
|
|
char **
|
|
login_getcaplist(login_cap_t *lc, const char * cap, const char * chars)
|
|
{
|
|
char * lstring;
|
|
|
|
if (chars == NULL)
|
|
chars = ", \t";
|
|
if ((lstring = login_getcapstr(lc, (char*)cap, NULL, NULL)) != NULL)
|
|
return arrayize(lstring, chars, NULL);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/*
|
|
* login_getpath()
|
|
* From the login_cap_t <lc>, get the capability <cap> which is
|
|
* formatted as either a space or comma delimited list of paths
|
|
* and append them all into a string and separate by semicolons.
|
|
* If there is an error of any kind, return <error>.
|
|
*/
|
|
|
|
char *
|
|
login_getpath(login_cap_t *lc, const char *cap, char * error)
|
|
{
|
|
char *str = login_getcapstr(lc, (char*)cap, NULL, NULL);
|
|
|
|
if (str == NULL)
|
|
str = error;
|
|
else {
|
|
char *ptr = str;
|
|
|
|
while (*ptr) {
|
|
int count = strcspn(ptr, ", \t");
|
|
ptr += count;
|
|
if (*ptr)
|
|
*ptr++ = ':';
|
|
}
|
|
}
|
|
return str;
|
|
}
|
|
|
|
|
|
/*
|
|
* login_getcaptime()
|
|
* From the login_cap_t <lc>, get the capability <cap>, which is
|
|
* formatted as a time (e.g., "<cap>=10h3m2s"). If <cap> is not
|
|
* present in <lc>, return <def>; if there is an error of some kind,
|
|
* return <error>.
|
|
*/
|
|
|
|
rlim_t
|
|
login_getcaptime(login_cap_t *lc, const char *cap, rlim_t def, rlim_t error)
|
|
{
|
|
char *res, *ep;
|
|
int ret;
|
|
rlim_t tot;
|
|
|
|
errno = 0;
|
|
if (lc == NULL || lc->lc_cap == NULL)
|
|
return def;
|
|
|
|
/*
|
|
* Look for <cap> in lc_cap.
|
|
* If it's not there (-1), return <def>.
|
|
* If there's an error, return <error>.
|
|
*/
|
|
|
|
if ((ret = cgetstr(lc->lc_cap, (char *)cap, &res)) == -1)
|
|
return def;
|
|
else if (ret < 0)
|
|
return error;
|
|
|
|
/*
|
|
* "inf" and "infinity" are two special cases for this.
|
|
*/
|
|
if (!strcasecmp(res, "infinity") || !strcasecmp(res, "inf"))
|
|
return RLIM_INFINITY;
|
|
|
|
/*
|
|
* Now go through the string, turning something like 1h2m3s into
|
|
* an integral value. Whee.
|
|
*/
|
|
|
|
errno = 0;
|
|
tot = 0;
|
|
while (*res) {
|
|
rlim_t tim = STRTOV(res, &ep, 0);
|
|
if ((ep == NULL) || (ep == res) || errno) {
|
|
return error;
|
|
}
|
|
/* Look for suffixes */
|
|
switch (*ep++) {
|
|
case 0:
|
|
ep--; break; /* end of string */
|
|
case 's': case 'S': /* seconds */
|
|
break;
|
|
case 'm': case 'M': /* minutes */
|
|
tim *= 60L;
|
|
break;
|
|
case 'h': case 'H': /* hours */
|
|
tim *= (60L * 60L);
|
|
break;
|
|
case 'd': case 'D': /* days */
|
|
tim *= (60L * 60L * 24L);
|
|
break;
|
|
case 'w': case 'W': /* weeks */
|
|
tim *= (60L * 60L * 24L * 7L);
|
|
case 'y': case 'Y': /* Years */
|
|
/* I refuse to take leap years into account here. Sue me. */
|
|
tim *= (60L * 60L * 24L * 365L);
|
|
default:
|
|
return error;
|
|
}
|
|
res = ep;
|
|
tot += tim;
|
|
}
|
|
return tot;
|
|
}
|
|
|
|
|
|
/*
|
|
* login_getcapnum()
|
|
* From the login_cap_t <lc>, extract the numerical value <cap>.
|
|
* If it is not present, return <def> for a default, and return
|
|
* <error> if there is an error.
|
|
* Like login_getcaptime(), only it only converts to a number, not
|
|
* to a time; "infinity" and "inf" are 'special.'
|
|
*/
|
|
|
|
rlim_t
|
|
login_getcapnum(login_cap_t *lc, const char *cap, rlim_t def, rlim_t error)
|
|
{
|
|
char *ep, *res;
|
|
int ret;
|
|
rlim_t val;
|
|
|
|
if (lc == NULL || lc->lc_cap == NULL)
|
|
return def;
|
|
|
|
/*
|
|
* For BSDI compatibility, try for the tag=<val> first
|
|
*/
|
|
if ((ret = cgetstr(lc->lc_cap, (char *)cap, &res)) == -1) {
|
|
long lval;
|
|
/*
|
|
* String capability not present, so try for tag#<val> as numeric
|
|
*/
|
|
if ((ret = cgetnum(lc->lc_cap, (char *)cap, &lval)) == -1)
|
|
return def; /* Not there, so return default */
|
|
else if (ret < 0)
|
|
return error;
|
|
return (rlim_t)lval;
|
|
}
|
|
else if (ret < 0)
|
|
return error;
|
|
|
|
if (!strcasecmp(res, "infinity") || !strcasecmp(res, "inf"))
|
|
return RLIM_INFINITY;
|
|
|
|
errno = 0;
|
|
val = STRTOV(res, &ep, 0);
|
|
if ((ep == NULL) || (ep == res) || errno)
|
|
return error;
|
|
return val;
|
|
}
|
|
|
|
|
|
/*
|
|
* login_getcapsize()
|
|
* From the login_cap_t <lc>, extract the capability <cap>, which is
|
|
* formatted as a size (e.g., "<cap>=10M"); it can also be "infinity".
|
|
* If not present, return <def>, or <error> if there is an error of
|
|
* some sort.
|
|
*/
|
|
|
|
rlim_t
|
|
login_getcapsize(login_cap_t *lc, const char *cap, rlim_t def, rlim_t error) {
|
|
char *ep, *res;
|
|
int ret;
|
|
rlim_t tot, mult;
|
|
|
|
if (lc == NULL || lc->lc_cap == NULL)
|
|
return def;
|
|
|
|
if ((ret = cgetstr(lc->lc_cap, (char *)cap, &res)) == -1)
|
|
return def;
|
|
else if (ret < 0)
|
|
return error;
|
|
|
|
/*
|
|
* "inf" and "infinity" are two special cases for this.
|
|
*/
|
|
if (!strcasecmp(res, "infinity") || !strcasecmp(res, "inf"))
|
|
return RLIM_INFINITY;
|
|
|
|
errno = 0;
|
|
tot = 0;
|
|
while (*res) {
|
|
rlim_t val = STRTOV(res, &ep, 0);
|
|
if ((res == NULL) || (res == ep) || errno)
|
|
return error;
|
|
switch (*ep++) {
|
|
case 0: /* end of string */
|
|
ep--;
|
|
mult = 1;
|
|
break;
|
|
case 'b': case 'B': /* 512-byte blocks */
|
|
mult = 512; break;
|
|
case 'k': case 'K': /* 1024-byte Kilobytes */
|
|
mult = 1024; break;
|
|
case 'm': case 'M': /* 1024-k kbytes */
|
|
mult = 1024 * 1024; break;
|
|
case 'g': case 'G': /* 1Gbyte */
|
|
mult = 1024 * 1024 * 1024; break;
|
|
#ifndef RLIM_LONG
|
|
case 't': case 'T': /* 1TBte */
|
|
mult = 1024LL * 1024LL * 1024LL * 1024LL; break;
|
|
#endif
|
|
default:
|
|
return error;
|
|
}
|
|
res = ep;
|
|
tot += (val * mult);
|
|
}
|
|
return tot;
|
|
}
|
|
|
|
|
|
/*
|
|
* login_getcapbool()
|
|
* From the login_cap_t <lc>, check for the existance of the capability
|
|
* of <cap>. Return <def> if <lc>->lc_cap is NULL, otherwise return
|
|
* the whether or not <cap> exists there.
|
|
*/
|
|
|
|
int
|
|
login_getcapbool(login_cap_t *lc, const char *cap, int def)
|
|
{
|
|
if (lc == NULL || lc->lc_cap == NULL)
|
|
return def;
|
|
return (cgetcap(lc->lc_cap, (char *)cap, ':') != NULL);
|
|
}
|
|
|
|
|
|
/*
|
|
* login_getstyle()
|
|
* Given a login_cap entry <lc>, and optionally a type of auth <auth>,
|
|
* and optionally a style <style>, find the style that best suits these
|
|
* rules:
|
|
* 1. If <auth> is non-null, look for an "auth-<auth>=" string
|
|
* in the capability; if not present, default to "auth=".
|
|
* 2. If there is no auth list found from (1), default to
|
|
* "passwd" as an authorization list.
|
|
* 3. If <style> is non-null, look for <style> in the list of
|
|
* authorization methods found from (2); if <style> is NULL, default
|
|
* to LOGIN_DEFSTYLE ("passwd").
|
|
* 4. If the chosen style is found in the chosen list of authorization
|
|
* methods, return that; otherwise, return NULL.
|
|
* E.g.:
|
|
* login_getstyle(lc, NULL, "ftp");
|
|
* login_getstyle(lc, "login", NULL);
|
|
* login_getstyle(lc, "skey", "network");
|
|
*/
|
|
|
|
char *
|
|
login_getstyle(login_cap_t *lc, char *style, const char *auth)
|
|
{
|
|
int i;
|
|
char **authtypes = NULL;
|
|
char *auths= NULL;
|
|
char realauth[64];
|
|
|
|
static char *defauthtypes[] = { LOGIN_DEFSTYLE, NULL };
|
|
|
|
if (auth != NULL && *auth != '\0' &&
|
|
snprintf(realauth, sizeof realauth, "auth-%s", auth) < sizeof realauth)
|
|
authtypes = login_getcaplist(lc, realauth, NULL);
|
|
|
|
if (authtypes == NULL)
|
|
authtypes = login_getcaplist(lc, "auth", NULL);
|
|
|
|
if (authtypes == NULL)
|
|
authtypes = defauthtypes;
|
|
|
|
/*
|
|
* We have at least one authtype now; auths is a comma-seperated
|
|
* (or space-separated) list of authentication types. We have to
|
|
* convert from this to an array of char*'s; authtypes then gets this.
|
|
*/
|
|
i = 0;
|
|
if (style != NULL && *style != '\0') {
|
|
while (authtypes[i] != NULL && strcmp(style, authtypes[i]) != 0)
|
|
i++;
|
|
}
|
|
lc->lc_style = NULL;
|
|
if (authtypes[i] != NULL && (auths = strdup(authtypes[i])) != NULL)
|
|
lc->lc_style = auths;
|
|
|
|
return lc->lc_style;
|
|
}
|
|
|
|
|