133 lines
3.7 KiB
C
133 lines
3.7 KiB
C
/*
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* Copyright (c) 1996, 1998-2005, 2010-2015
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* Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F39502-99-1-0512.
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*/
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#include <config.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include <errno.h>
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#include "sudoers.h"
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/*
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* This function finds the full pathname for a command and
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* stores it in a statically allocated array, filling in a pointer
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* to the array. Returns FOUND if the command was found, NOT_FOUND
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* if it was not found, or NOT_FOUND_DOT if it would have been found
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* but it is in '.' and IGNORE_DOT is set.
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*/
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int
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find_path(const char *infile, char **outfile, struct stat *sbp,
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const char *path, int ignore_dot)
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{
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static char command[PATH_MAX];
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const char *cp, *ep, *pathend;
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bool found = false;
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bool checkdot = false;
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int len;
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debug_decl(find_path, SUDOERS_DEBUG_UTIL)
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if (strlen(infile) >= PATH_MAX) {
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errno = ENAMETOOLONG;
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debug_return_int(NOT_FOUND_ERROR);
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}
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/*
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* If we were given a fully qualified or relative path
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* there is no need to look at $PATH.
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*/
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if (strchr(infile, '/') != NULL) {
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strlcpy(command, infile, sizeof(command)); /* paranoia */
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if (sudo_goodpath(command, sbp)) {
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*outfile = command;
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debug_return_int(FOUND);
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} else
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debug_return_int(NOT_FOUND);
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}
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if (path == NULL)
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debug_return_int(NOT_FOUND);
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pathend = path + strlen(path);
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for (cp = sudo_strsplit(path, pathend, ":", &ep); cp != NULL;
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cp = sudo_strsplit(NULL, pathend, ":", &ep)) {
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/*
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* Search current dir last if it is in PATH.
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* This will miss sneaky things like using './' or './/' (XXX)
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*/
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if (cp == ep || (*cp == '.' && cp + 1 == ep)) {
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checkdot = 1;
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continue;
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}
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/*
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* Resolve the path and exit the loop if found.
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*/
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len = snprintf(command, sizeof(command), "%.*s/%s",
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(int)(ep - cp), cp, infile);
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if (len <= 0 || (size_t)len >= sizeof(command)) {
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errno = ENAMETOOLONG;
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debug_return_int(NOT_FOUND_ERROR);
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}
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if ((found = sudo_goodpath(command, sbp)))
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break;
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}
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/*
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* Check current dir if dot was in the PATH
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*/
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if (!found && checkdot) {
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len = snprintf(command, sizeof(command), "./%s", infile);
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if (len <= 0 || (size_t)len >= sizeof(command)) {
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errno = ENAMETOOLONG;
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debug_return_int(NOT_FOUND_ERROR);
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}
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found = sudo_goodpath(command, sbp);
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if (found && ignore_dot)
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debug_return_int(NOT_FOUND_DOT);
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}
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if (found) {
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*outfile = command;
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debug_return_int(FOUND);
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} else
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debug_return_int(NOT_FOUND);
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}
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