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Annotation of embedaddon/sudo/plugins/sudoers/find_path.c, revision 1.1.1.3

1.1       misho       1: /*
1.1.1.3 ! misho       2:  * Copyright (c) 1996, 1998-2005, 2010-2013
1.1       misho       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/stat.h>
                     26: #include <stdio.h>
                     27: #ifdef STDC_HEADERS
                     28: # include <stdlib.h>
                     29: # include <stddef.h>
                     30: #else
                     31: # ifdef HAVE_STDLIB_H
                     32: #  include <stdlib.h>
                     33: # endif
                     34: #endif /* STDC_HEADERS */
                     35: #ifdef HAVE_STRING_H
                     36: # include <string.h>
                     37: #endif /* HAVE_STRING_H */
                     38: #ifdef HAVE_STRINGS_H
                     39: # include <strings.h>
                     40: #endif /* HAVE_STRINGS_H */
                     41: #ifdef HAVE_UNISTD_H
                     42: # include <unistd.h>
                     43: #endif /* HAVE_UNISTD_H */
                     44: #include <errno.h>
                     45: 
                     46: #include "sudoers.h"
                     47: 
                     48: /*
                     49:  * This function finds the full pathname for a command and
                     50:  * stores it in a statically allocated array, filling in a pointer
                     51:  * to the array.  Returns FOUND if the command was found, NOT_FOUND
                     52:  * if it was not found, or NOT_FOUND_DOT if it would have been found
                     53:  * but it is in '.' and IGNORE_DOT is set.
                     54:  */
                     55: int
                     56: find_path(char *infile, char **outfile, struct stat *sbp, char *path,
                     57:     int ignore_dot)
                     58: {
                     59:     static char command[PATH_MAX]; /* qualified filename */
                     60:     char *n;                   /* for traversing path */
                     61:     char *origpath;            /* so we can free path later */
1.1.1.2   misho      62:     bool found = false;                /* did we find the command? */
                     63:     bool checkdot = false;     /* check current dir? */
1.1       misho      64:     int len;                   /* length parameter */
1.1.1.2   misho      65:     debug_decl(find_path, SUDO_DEBUG_UTIL)
1.1       misho      66: 
1.1.1.3 ! misho      67:     if (strlen(infile) >= PATH_MAX) {
        !            68:        errno = ENAMETOOLONG;
        !            69:        fatal("%s", infile);
        !            70:     }
1.1       misho      71: 
                     72:     /*
                     73:      * If we were given a fully qualified or relative path
                     74:      * there is no need to look at $PATH.
                     75:      */
                     76:     if (strchr(infile, '/')) {
                     77:        strlcpy(command, infile, sizeof(command));      /* paranoia */
                     78:        if (sudo_goodpath(command, sbp)) {
                     79:            *outfile = command;
1.1.1.2   misho      80:            debug_return_int(FOUND);
1.1       misho      81:        } else
1.1.1.2   misho      82:            debug_return_int(NOT_FOUND);
1.1       misho      83:     }
                     84: 
                     85:     if (path == NULL)
1.1.1.2   misho      86:        debug_return_int(NOT_FOUND);
1.1       misho      87:     path = estrdup(path);
                     88:     origpath = path;
                     89: 
                     90:     do {
                     91:        if ((n = strchr(path, ':')))
                     92:            *n = '\0';
                     93: 
                     94:        /*
                     95:         * Search current dir last if it is in PATH This will miss sneaky
                     96:         * things like using './' or './/'
                     97:         */
                     98:        if (*path == '\0' || (*path == '.' && *(path + 1) == '\0')) {
                     99:            checkdot = 1;
                    100:            path = n + 1;
                    101:            continue;
                    102:        }
                    103: 
                    104:        /*
                    105:         * Resolve the path and exit the loop if found.
                    106:         */
                    107:        len = snprintf(command, sizeof(command), "%s/%s", path, infile);
1.1.1.3 ! misho     108:        if (len <= 0 || len >= sizeof(command)) {
        !           109:            errno = ENAMETOOLONG;
        !           110:            fatal("%s", infile);
        !           111:        }
1.1.1.2   misho     112:        if ((found = sudo_goodpath(command, sbp)))
1.1       misho     113:            break;
                    114: 
                    115:        path = n + 1;
                    116: 
                    117:     } while (n);
                    118:     efree(origpath);
                    119: 
                    120:     /*
                    121:      * Check current dir if dot was in the PATH
                    122:      */
1.1.1.2   misho     123:     if (!found && checkdot) {
1.1       misho     124:        len = snprintf(command, sizeof(command), "./%s", infile);
1.1.1.3 ! misho     125:        if (len <= 0 || len >= sizeof(command)) {
        !           126:            errno = ENAMETOOLONG;
        !           127:            fatal("%s", infile);
        !           128:        }
1.1.1.2   misho     129:        found = sudo_goodpath(command, sbp);
                    130:        if (found && ignore_dot)
                    131:            debug_return_int(NOT_FOUND_DOT);
1.1       misho     132:     }
                    133: 
1.1.1.2   misho     134:     if (found) {
                    135:        *outfile = command;
                    136:        debug_return_int(FOUND);
1.1       misho     137:     } else
1.1.1.2   misho     138:        debug_return_int(NOT_FOUND);
1.1       misho     139: }