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Annotation of embedaddon/sudo/plugins/sudoers/find_path.c, revision 1.1

1.1     ! misho       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: }