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Initial revision

    1: /*
    2:  * Copyright (c) 1996, 1998-2005, 2010-2011
    3:  *	Todd C. Miller <Todd.Miller@courtesan.com>
    4:  *
    5:  * Permission to use, copy, modify, and distribute this software for any
    6:  * purpose with or without fee is hereby granted, provided that the above
    7:  * copyright notice and this permission notice appear in all copies.
    8:  *
    9:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   10:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   11:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   12:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   13:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   14:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   15:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   16:  *
   17:  * Sponsored in part by the Defense Advanced Research Projects
   18:  * Agency (DARPA) and Air Force Research Laboratory, Air Force
   19:  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
   20:  */
   21: 
   22: #include <config.h>
   23: 
   24: #include <sys/types.h>
   25: #include <sys/param.h>
   26: #include <sys/stat.h>
   27: #include <stdio.h>
   28: #ifdef STDC_HEADERS
   29: # include <stdlib.h>
   30: # include <stddef.h>
   31: #else
   32: # ifdef HAVE_STDLIB_H
   33: #  include <stdlib.h>
   34: # endif
   35: #endif /* STDC_HEADERS */
   36: #ifdef HAVE_STRING_H
   37: # include <string.h>
   38: #endif /* HAVE_STRING_H */
   39: #ifdef HAVE_STRINGS_H
   40: # include <strings.h>
   41: #endif /* HAVE_STRINGS_H */
   42: #ifdef HAVE_UNISTD_H
   43: # include <unistd.h>
   44: #endif /* HAVE_UNISTD_H */
   45: #include <errno.h>
   46: 
   47: #include "sudoers.h"
   48: 
   49: /*
   50:  * This function finds the full pathname for a command and
   51:  * stores it in a statically allocated array, filling in a pointer
   52:  * to the array.  Returns FOUND if the command was found, NOT_FOUND
   53:  * if it was not found, or NOT_FOUND_DOT if it would have been found
   54:  * but it is in '.' and IGNORE_DOT is set.
   55:  */
   56: int
   57: find_path(char *infile, char **outfile, struct stat *sbp, char *path,
   58:     int ignore_dot)
   59: {
   60:     static char command[PATH_MAX]; /* qualified filename */
   61:     char *n;			/* for traversing path */
   62:     char *origpath;		/* so we can free path later */
   63:     char *result = NULL;	/* result of path/file lookup */
   64:     int checkdot = 0;		/* check current dir? */
   65:     int len;			/* length parameter */
   66: 
   67:     if (strlen(infile) >= PATH_MAX)
   68: 	errorx(1, _("%s: %s"), infile, strerror(ENAMETOOLONG));
   69: 
   70:     /*
   71:      * If we were given a fully qualified or relative path
   72:      * there is no need to look at $PATH.
   73:      */
   74:     if (strchr(infile, '/')) {
   75: 	strlcpy(command, infile, sizeof(command));	/* paranoia */
   76: 	if (sudo_goodpath(command, sbp)) {
   77: 	    *outfile = command;
   78: 	    return FOUND;
   79: 	} else
   80: 	    return NOT_FOUND;
   81:     }
   82: 
   83:     if (path == NULL)
   84: 	return NOT_FOUND;
   85:     path = estrdup(path);
   86:     origpath = path;
   87: 
   88:     do {
   89: 	if ((n = strchr(path, ':')))
   90: 	    *n = '\0';
   91: 
   92: 	/*
   93: 	 * Search current dir last if it is in PATH This will miss sneaky
   94: 	 * things like using './' or './/'
   95: 	 */
   96: 	if (*path == '\0' || (*path == '.' && *(path + 1) == '\0')) {
   97: 	    checkdot = 1;
   98: 	    path = n + 1;
   99: 	    continue;
  100: 	}
  101: 
  102: 	/*
  103: 	 * Resolve the path and exit the loop if found.
  104: 	 */
  105: 	len = snprintf(command, sizeof(command), "%s/%s", path, infile);
  106: 	if (len <= 0 || len >= sizeof(command))
  107: 	    errorx(1, _("%s: %s"), infile, strerror(ENAMETOOLONG));
  108: 	if ((result = sudo_goodpath(command, sbp)))
  109: 	    break;
  110: 
  111: 	path = n + 1;
  112: 
  113:     } while (n);
  114:     efree(origpath);
  115: 
  116:     /*
  117:      * Check current dir if dot was in the PATH
  118:      */
  119:     if (!result && checkdot) {
  120: 	len = snprintf(command, sizeof(command), "./%s", infile);
  121: 	if (len <= 0 || len >= sizeof(command))
  122: 	    errorx(1, _("%s: %s"), infile, strerror(ENAMETOOLONG));
  123: 	result = sudo_goodpath(command, sbp);
  124: 	if (result && ignore_dot)
  125: 	    return NOT_FOUND_DOT;
  126:     }
  127: 
  128:     if (result) {
  129: 	*outfile = result;
  130: 	return FOUND;
  131:     } else
  132: 	return NOT_FOUND;
  133: }