2 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
3 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
4 * Internet Initiative Japan, Inc (IIJ)
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * $FreeBSD: src/usr.sbin/ppp/systems.c,v 1.58.2.7 2002/09/01 02:12:32 brian Exp $
29 * $DragonFly: src/usr.sbin/ppp/systems.c,v 1.3 2008/03/11 10:53:07 hasso Exp $
32 #include <sys/param.h>
47 #define issep(ch) ((ch) == ' ' || (ch) == '\t')
50 OpenSecret(const char *file)
55 snprintf(line, sizeof line, "%s/%s", PPP_CONFDIR, file);
56 fp = ID0fopen(line, "r");
58 log_Printf(LogWARN, "OpenSecret: Can't open %s.\n", line);
69 * Move string from ``from'' to ``to'', interpreting ``~'' and $....
70 * Returns NULL if string expansion failed due to lack of buffer space.
73 InterpretArg(const char *from, char *to, size_t tosiz)
75 char *ptr, *startto, *endto;
82 endto = to + tosiz - 1;
87 while (*from != '\0') {
99 break; /* Swallow the escapes */
102 *to++ = '\\'; /* Pass the escapes on, maybe skipping \# */
110 if (from[1] == '$') {
111 *to = '\0'; /* For an empty var name below */
113 } else if (from[1] == '{') {
114 ptr = strchr(from+2, '}');
116 len = ptr - from - 2;
117 if (endto - to < len )
120 strncpy(to, from+2, len);
133 for (from++; (isalnum(*from) || *from == '_') && ptr < endto; from++)
141 else if ((env = getenv(to)) != NULL) {
142 if (endto - to < (int)strlen(env))
144 strncpy(to, env, endto - to);
151 ptr = strchr(++from, '/');
152 len = ptr ? (size_t)(ptr - from) : strlen(from);
154 pwd = getpwuid(ID0realuid());
156 if (endto - to < len)
158 strncpy(to, from, len);
167 if (endto - to < (int)strlen(pwd->pw_dir))
169 strncpy(to, pwd->pw_dir, endto - to);
183 while (to > startto) {
195 #define CTRL_UNKNOWN (0)
196 #define CTRL_INCLUDE (1)
199 DecodeCtrlCommand(char *line, char *arg, size_t argsiz)
203 if (!strncasecmp(line, "include", 7) && issep(line[7])) {
204 end = InterpretArg(line+8, arg, argsiz);
206 log_Printf(LogWARN, "Failed to expand command '%s': too long for the "
207 "destination buffer\n", line);
210 if (*end && *end != '#')
211 log_Printf(LogWARN, "usage: !include filename\n");
219 * Initialised in system_IsValid(), set in ReadSystem(),
220 * used by system_IsValid()
227 AllowUsers(struct cmdargs const *arg)
229 /* arg->bundle may be NULL (see system_IsValid()) ! */
236 pwd = getpwuid(ID0realuid());
238 for (f = arg->argn; f < arg->argc; f++)
239 if (!strcmp("*", arg->argv[f]) || !strcmp(pwd->pw_name, arg->argv[f])) {
249 AllowModes(struct cmdargs const *arg)
251 /* arg->bundle may be NULL (see system_IsValid()) ! */
252 int f, mode, allowed;
255 for (f = arg->argn; f < arg->argc; f++) {
256 mode = Nam2mode(arg->argv[f]);
257 if (mode == PHYS_NONE || mode == PHYS_ALL)
258 log_Printf(LogWARN, "allow modes: %s: Invalid mode\n", arg->argv[f]);
263 modeok = modereq & allowed ? 1 : 0;
273 while (len && (line[len-1] == '\n' || line[len-1] == '\r' ||
287 xgets(char *buf, int buflen, FILE *fp)
292 while (fgets(buf, buflen-1, fp)) {
294 buf[buflen-1] = '\0';
296 while (len && (buf[len-1] == '\n' || buf[len-1] == '\r'))
298 if (len && buf[len-1] == '\\') {
301 if (!buflen) /* No buffer space */
309 /* Values for ``how'' in ReadSystem */
310 #define SYSTEM_EXISTS 1
311 #define SYSTEM_VALIDATE 2
312 #define SYSTEM_EXEC 3
315 GetLabel(char *line, const char *filename, int linenum)
320 argc = MakeArgs(line, argv, MAXARGS, PARSE_REDUCE);
322 if (argc == 2 && !strcmp(argv[1], ":"))
325 if (argc != 1 || (len = strlen(argv[0])) < 2 || argv[0][len-1] != ':') {
326 log_Printf(LogWARN, "Bad label in %s (line %d) - missing colon\n",
330 argv[0][len-1] = '\0'; /* Lose the ':' */
335 /* Returns -2 for ``file not found'' and -1 for ``label not found'' */
338 ReadSystem(struct bundle *bundle, const char *name, const char *file,
339 struct prompt *prompt, struct datalink *cx, int how)
345 char filename[PATH_MAX];
355 snprintf(filename, sizeof filename, "%s", file);
357 snprintf(filename, sizeof filename, "%s/%s", PPP_CONFDIR, file);
358 fp = ID0fopen(filename, "r");
360 log_Printf(LogDEBUG, "ReadSystem: Can't open %s.\n", filename);
363 log_Printf(LogDEBUG, "ReadSystem: Checking %s (%s).\n", name, filename);
366 while ((n = xgets(line, sizeof line, fp))) {
374 case '\0': /* empty/comment */
378 switch (DecodeCtrlCommand(cp+1, arg, LINE_LEN)) {
380 log_Printf(LogCOMMAND, "%s: Including \"%s\"\n", filename, arg);
381 n = ReadSystem(bundle, name, arg, prompt, cx, how);
382 log_Printf(LogCOMMAND, "%s: Done include of \"%s\"\n", filename, arg);
385 return 0; /* got it */
389 log_Printf(LogWARN, "%s: %s: Invalid command\n", filename, cp);
395 if ((cp = GetLabel(cp, filename, linenum)) == NULL)
398 if (strcmp(cp, name) == 0) {
399 /* We're in business */
400 if (how == SYSTEM_EXISTS) {
404 while ((n = xgets(line, sizeof line, fp))) {
406 indent = issep(*line);
409 if (*cp == '\0') /* empty / comment */
412 if (!indent) { /* start of next section */
413 if (*cp != '!' && how == SYSTEM_EXEC)
414 cp = GetLabel(cp, filename, linenum);
419 if ((argc = command_Expand_Interpret(cp, len, argv, cp - line)) < 0)
420 log_Printf(LogWARN, "%s: %d: Syntax error\n", filename, linenum);
422 allowcmd = argc > 0 && !strcasecmp(argv[0], "allow");
423 if ((how != SYSTEM_EXEC && allowcmd) ||
424 (how == SYSTEM_EXEC && !allowcmd)) {
426 * Disable any context so that warnings are given to everyone,
429 op = log_PromptContext;
430 log_PromptContext = NULL;
431 command_Run(bundle, argc, (char const *const *)argv, prompt,
433 log_PromptContext = op;
438 fclose(fp); /* everything read - get out */
449 system_IsValid(const char *name, struct prompt *prompt, int mode)
452 * Note: The ReadSystem() calls only result in calls to the Allow*
453 * functions. arg->bundle will be set to NULL for these commands !
458 def = !strcmp(name, "default");
459 how = ID0realuid() == 0 ? SYSTEM_EXISTS : SYSTEM_VALIDATE;
464 rs = ReadSystem(NULL, "default", CONFFILE, prompt, NULL, how);
471 rs = 0; /* we don't care that ``default'' doesn't exist */
474 rs = ReadSystem(NULL, name, CONFFILE, prompt, NULL, how);
477 return "Configuration label not found";
480 return PPP_CONFDIR "/" CONFFILE " : File not found";
486 if (how == SYSTEM_EXISTS)
490 return "User access denied";
493 return "Mode denied for this label";
499 system_Select(struct bundle *bundle, const char *name, const char *file,
500 struct prompt *prompt, struct datalink *cx)
504 return ReadSystem(bundle, name, file, prompt, cx, SYSTEM_EXEC);