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
31 #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);
68 /* Move string from ``from'' to ``to'', interpreting ``~'' and $.... */
70 InterpretArg(const char *from, char *to)
72 char *ptr, *startto, *endto;
79 endto = to + LINE_LEN - 1;
84 while (*from != '\0') {
94 break; /* Swallow the escapes */
97 *to++ = '\\'; /* Pass the escapes on, maybe skipping \# */
103 if (from[1] == '$') {
104 *to = '\0'; /* For an empty var name below */
106 } else if (from[1] == '{') {
107 ptr = strchr(from+2, '}');
109 len = ptr - from - 2;
110 if (endto - to < len )
113 strncpy(to, from+2, len);
126 for (from++; (isalnum(*from) || *from == '_') && ptr < endto; from++)
132 else if ((env = getenv(to)) != NULL) {
133 strncpy(to, env, endto - to);
140 ptr = strchr(++from, '/');
141 len = ptr ? ptr - from : strlen(from);
143 pwd = getpwuid(ID0realuid());
145 strncpy(to, from, len);
152 strncpy(to, pwd->pw_dir, endto - to);
166 while (to > startto) {
178 #define CTRL_UNKNOWN (0)
179 #define CTRL_INCLUDE (1)
182 DecodeCtrlCommand(char *line, char *arg)
186 if (!strncasecmp(line, "include", 7) && issep(line[7])) {
187 end = InterpretArg(line+8, arg);
188 if (*end && *end != '#')
189 log_Printf(LogWARN, "usage: !include filename\n");
197 * Initialised in system_IsValid(), set in ReadSystem(),
198 * used by system_IsValid()
205 AllowUsers(struct cmdargs const *arg)
207 /* arg->bundle may be NULL (see system_IsValid()) ! */
214 pwd = getpwuid(ID0realuid());
216 for (f = arg->argn; f < arg->argc; f++)
217 if (!strcmp("*", arg->argv[f]) || !strcmp(pwd->pw_name, arg->argv[f])) {
227 AllowModes(struct cmdargs const *arg)
229 /* arg->bundle may be NULL (see system_IsValid()) ! */
230 int f, mode, allowed;
233 for (f = arg->argn; f < arg->argc; f++) {
234 mode = Nam2mode(arg->argv[f]);
235 if (mode == PHYS_NONE || mode == PHYS_ALL)
236 log_Printf(LogWARN, "allow modes: %s: Invalid mode\n", arg->argv[f]);
241 modeok = modereq & allowed ? 1 : 0;
251 while (len && (line[len-1] == '\n' || line[len-1] == '\r' ||
265 xgets(char *buf, int buflen, FILE *fp)
270 while (fgets(buf, buflen-1, fp)) {
272 buf[buflen-1] = '\0';
274 while (len && (buf[len-1] == '\n' || buf[len-1] == '\r'))
276 if (len && buf[len-1] == '\\') {
279 if (!buflen) /* No buffer space */
287 /* Values for ``how'' in ReadSystem */
288 #define SYSTEM_EXISTS 1
289 #define SYSTEM_VALIDATE 2
290 #define SYSTEM_EXEC 3
293 GetLabel(char *line, const char *filename, int linenum)
298 argc = MakeArgs(line, argv, MAXARGS, PARSE_REDUCE);
300 if (argc == 2 && !strcmp(argv[1], ":"))
303 if (argc != 1 || (len = strlen(argv[0])) < 2 || argv[0][len-1] != ':') {
304 log_Printf(LogWARN, "Bad label in %s (line %d) - missing colon\n",
308 argv[0][len-1] = '\0'; /* Lose the ':' */
313 /* Returns -2 for ``file not found'' and -1 for ``label not found'' */
316 ReadSystem(struct bundle *bundle, const char *name, const char *file,
317 struct prompt *prompt, struct datalink *cx, int how)
323 char filename[PATH_MAX];
333 snprintf(filename, sizeof filename, "%s", file);
335 snprintf(filename, sizeof filename, "%s/%s", PPP_CONFDIR, file);
336 fp = ID0fopen(filename, "r");
338 log_Printf(LogDEBUG, "ReadSystem: Can't open %s.\n", filename);
341 log_Printf(LogDEBUG, "ReadSystem: Checking %s (%s).\n", name, filename);
344 while ((n = xgets(line, sizeof line, fp))) {
352 case '\0': /* empty/comment */
356 switch (DecodeCtrlCommand(cp+1, arg)) {
358 log_Printf(LogCOMMAND, "%s: Including \"%s\"\n", filename, arg);
359 n = ReadSystem(bundle, name, arg, prompt, cx, how);
360 log_Printf(LogCOMMAND, "%s: Done include of \"%s\"\n", filename, arg);
363 return 0; /* got it */
367 log_Printf(LogWARN, "%s: %s: Invalid command\n", filename, cp);
373 if ((cp = GetLabel(cp, filename, linenum)) == NULL)
376 if (strcmp(cp, name) == 0) {
377 /* We're in business */
378 if (how == SYSTEM_EXISTS) {
382 while ((n = xgets(line, sizeof line, fp))) {
384 indent = issep(*line);
387 if (*cp == '\0') /* empty / comment */
390 if (!indent) { /* start of next section */
391 if (*cp != '!' && how == SYSTEM_EXEC)
392 cp = GetLabel(cp, filename, linenum);
397 if ((argc = command_Expand_Interpret(cp, len, argv, cp - line)) < 0)
398 log_Printf(LogWARN, "%s: %d: Syntax error\n", filename, linenum);
400 allowcmd = argc > 0 && !strcasecmp(argv[0], "allow");
401 if ((how != SYSTEM_EXEC && allowcmd) ||
402 (how == SYSTEM_EXEC && !allowcmd)) {
404 * Disable any context so that warnings are given to everyone,
407 op = log_PromptContext;
408 log_PromptContext = NULL;
409 command_Run(bundle, argc, (char const *const *)argv, prompt,
411 log_PromptContext = op;
416 fclose(fp); /* everything read - get out */
427 system_IsValid(const char *name, struct prompt *prompt, int mode)
430 * Note: The ReadSystem() calls only result in calls to the Allow*
431 * functions. arg->bundle will be set to NULL for these commands !
436 def = !strcmp(name, "default");
437 how = ID0realuid() == 0 ? SYSTEM_EXISTS : SYSTEM_VALIDATE;
442 rs = ReadSystem(NULL, "default", CONFFILE, prompt, NULL, how);
449 rs = 0; /* we don't care that ``default'' doesn't exist */
452 rs = ReadSystem(NULL, name, CONFFILE, prompt, NULL, how);
455 return "Configuration label not found";
458 return PPP_CONFDIR "/" CONFFILE " : File not found";
464 if (how == SYSTEM_EXISTS)
468 return "User access denied";
471 return "Mode denied for this label";
477 system_Select(struct bundle *bundle, const char *name, const char *file,
478 struct prompt *prompt, struct datalink *cx)
482 return ReadSystem(bundle, name, file, prompt, cx, SYSTEM_EXEC);