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