367 lines
8.1 KiB
C
367 lines
8.1 KiB
C
/*
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* System configuration routines
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*
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* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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*
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* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the Internet Initiative Japan, Inc. The name of the
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* IIJ may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id: systems.c,v 1.34 1997/12/24 09:29:17 brian Exp $
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*
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* TODO:
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*/
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <ctype.h>
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#include <pwd.h>
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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 "command.h"
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#include "mbuf.h"
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#include "log.h"
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#include "id.h"
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#include "defs.h"
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#include "timer.h"
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#include "fsm.h"
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#include "loadalias.h"
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#include "pathnames.h"
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#include "vars.h"
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#include "server.h"
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#include "systems.h"
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#define issep(ch) ((ch) == ' ' || (ch) == '\t')
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FILE *
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OpenSecret(const char *file)
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{
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FILE *fp;
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char line[100];
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snprintf(line, sizeof line, "%s/%s", _PATH_PPP, file);
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fp = ID0fopen(line, "r");
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if (fp == NULL)
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LogPrintf(LogWARN, "OpenSecret: Can't open %s.\n", line);
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return (fp);
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}
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void
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CloseSecret(FILE * fp)
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{
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fclose(fp);
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}
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/* Move string from ``from'' to ``to'', interpreting ``~'' and $.... */
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static void
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InterpretArg(char *from, char *to)
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{
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const char *env;
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char *ptr, *startto, *endto;
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int len;
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startto = to;
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endto = to + LINE_LEN - 1;
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while(issep(*from))
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from++;
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if (*from == '~') {
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ptr = strchr(++from, '/');
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len = ptr ? ptr - from : strlen(from);
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if (len == 0) {
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if ((env = getenv("HOME")) == NULL)
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env = _PATH_PPP;
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strncpy(to, env, endto - to);
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} else {
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struct passwd *pwd;
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strncpy(to, from, len);
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to[len] = '\0';
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pwd = getpwnam(to);
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if (pwd)
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strncpy(to, pwd->pw_dir, endto-to);
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else
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strncpy(to, _PATH_PPP, endto - to);
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endpwent();
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}
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*endto = '\0';
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to += strlen(to);
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from += len;
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}
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while (to < endto && *from != '\0') {
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if (*from == '$') {
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if (from[1] == '$') {
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*to = '\0'; /* For an empty var name below */
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from += 2;
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} else if (from[1] == '{') {
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ptr = strchr(from+2, '}');
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if (ptr) {
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len = ptr - from - 2;
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if (endto - to < len )
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len = endto - to;
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if (len) {
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strncpy(to, from+2, len);
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to[len] = '\0';
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from = ptr+1;
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} else {
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*to++ = *from++;
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continue;
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}
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} else {
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*to++ = *from++;
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continue;
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}
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} else {
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ptr = to;
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for (from++; (isalnum(*from) || *from == '_') && ptr < endto; from++)
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*ptr++ = *from;
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*ptr = '\0';
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}
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if (*to == '\0')
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*to++ = '$';
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else if ((env = getenv(to)) != NULL) {
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strncpy(to, env, endto - to);
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*endto = '\0';
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to += strlen(to);
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}
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} else
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*to++ = *from++;
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}
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while (to > startto) {
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to--;
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if (!issep(*to)) {
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to++;
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break;
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}
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}
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*to = '\0';
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}
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#define CTRL_UNKNOWN (0)
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#define CTRL_INCLUDE (1)
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static int
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DecodeCtrlCommand(char *line, char *arg)
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{
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if (!strncasecmp(line, "include", 7) && issep(line[7])) {
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InterpretArg(line+8, arg);
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return CTRL_INCLUDE;
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}
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return CTRL_UNKNOWN;
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}
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static int userok;
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int
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AllowUsers(struct cmdargs const *arg)
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{
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int f;
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char *user;
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userok = 0;
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user = getlogin();
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if (user && *user)
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for (f = 0; f < arg->argc; f++)
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if (!strcmp("*", arg->argv[f]) || !strcmp(user, arg->argv[f])) {
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userok = 1;
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break;
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}
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return 0;
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}
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static struct {
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int mode;
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const char *name;
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} modes[] = {
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{ MODE_INTER, "interactive" },
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{ MODE_AUTO, "auto" },
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{ MODE_DIRECT, "direct" },
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{ MODE_DEDICATED, "dedicated" },
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{ MODE_DDIAL, "ddial" },
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{ MODE_BACKGROUND, "background" },
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{ ~0, "*" },
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{ 0, 0 }
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};
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static int modeok;
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int
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AllowModes(struct cmdargs const *arg)
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{
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int f;
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int m;
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int allowed;
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allowed = 0;
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for (f = 0; f < arg->argc; f++) {
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for (m = 0; modes[m].mode; m++)
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if (!strcasecmp(modes[m].name, arg->argv[f])) {
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allowed |= modes[m].mode;
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break;
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}
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if (modes[m].mode == 0)
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LogPrintf(LogWARN, "allow modes: %s: Invalid mode\n", arg->argv[f]);
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}
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modeok = (mode | allowed) == allowed ? 1 : 0;
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return 0;
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}
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static int
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ReadSystem(const char *name, const char *file, int doexec)
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{
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FILE *fp;
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char *cp, *wp;
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int n, len;
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u_char olauth;
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char line[LINE_LEN];
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char filename[MAXPATHLEN];
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int linenum;
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int argc;
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char **argv;
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int allowcmd;
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if (*file == '/')
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snprintf(filename, sizeof filename, "%s", file);
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else
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snprintf(filename, sizeof filename, "%s/%s", _PATH_PPP, file);
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fp = ID0fopen(filename, "r");
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if (fp == NULL) {
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LogPrintf(LogDEBUG, "ReadSystem: Can't open %s.\n", filename);
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return (-1);
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}
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LogPrintf(LogDEBUG, "ReadSystem: Checking %s (%s).\n", name, filename);
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linenum = 0;
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while (fgets(line, sizeof line, fp)) {
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linenum++;
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cp = line;
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switch (*cp) {
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case '#': /* comment */
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break;
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case ' ':
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case '\t':
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break;
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default:
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wp = strpbrk(cp, ":\n");
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if (wp == NULL) {
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LogPrintf(LogWARN, "Bad rule in %s (line %d) - missing colon.\n",
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filename, linenum);
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ServerClose();
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exit(1);
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}
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*wp = '\0';
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if (*cp == '!') {
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char arg[LINE_LEN];
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switch (DecodeCtrlCommand(cp+1, arg)) {
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case CTRL_INCLUDE:
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LogPrintf(LogCOMMAND, "%s: Including \"%s\"\n", filename, arg);
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n = ReadSystem(name, arg, doexec);
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LogPrintf(LogCOMMAND, "%s: Done include of \"%s\"\n", filename, arg);
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if (!n)
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return 0; /* got it */
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break;
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default:
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LogPrintf(LogWARN, "%s: %s: Invalid command\n", filename, cp);
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break;
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}
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} else if (strcmp(cp, name) == 0) {
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while (fgets(line, sizeof line, fp)) {
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cp = line;
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if (issep(*cp)) {
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n = strspn(cp, " \t");
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cp += n;
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len = strlen(cp);
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if (!len || *cp == '#')
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continue;
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if (cp[len-1] == '\n')
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cp[--len] = '\0';
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if (!len)
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continue;
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InterpretCommand(cp, len, &argc, &argv);
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allowcmd = argc > 0 && !strcasecmp(*argv, "allow");
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if ((!doexec && allowcmd) || (doexec && !allowcmd)) {
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olauth = VarLocalAuth;
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if (VarLocalAuth == LOCAL_NO_AUTH)
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VarLocalAuth = LOCAL_AUTH;
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RunCommand(argc, (char const *const *)argv, name);
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VarLocalAuth = olauth;
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}
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} else if (*cp == '#' || *cp == '\n' || *cp == '\0') {
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continue;
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} else
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break;
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}
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fclose(fp);
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return (0);
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}
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break;
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}
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}
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fclose(fp);
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return -1;
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}
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int
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ValidSystem(const char *name)
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{
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if (ID0realuid() == 0)
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return userok = modeok = 1;
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userok = 0;
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modeok = 1;
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ReadSystem("default", CONFFILE, 0);
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if (name != NULL)
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ReadSystem(name, CONFFILE, 0);
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return userok && modeok;
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}
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int
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SelectSystem(const char *name, const char *file)
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{
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userok = modeok = 1;
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return ReadSystem(name, file, 1);
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}
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int
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LoadCommand(struct cmdargs const *arg)
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{
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const char *name;
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if (arg->argc > 0)
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name = *arg->argv;
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else
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name = "default";
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if (!ValidSystem(name)) {
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LogPrintf(LogERROR, "%s: Label not allowed\n", name);
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return 1;
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} else if (SelectSystem(name, CONFFILE) < 0) {
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LogPrintf(LogWARN, "%s: label not found.\n", name);
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return -1;
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} else
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SetLabel(arg->argc ? name : NULL);
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return 0;
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}
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int
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SaveCommand(struct cmdargs const *arg)
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{
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LogPrintf(LogWARN, "save command is not implemented (yet).\n");
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return 1;
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}
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