| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Check a user's file search path |
| 4 | * |
| 5 | * (c) 1999 Mark Wooding |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of chkpath. |
| 11 | * |
| 12 | * chkpath is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * chkpath is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with chkpath; if not, write to the Free Software Foundation, |
| 24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 25 | */ |
| 26 | |
| 27 | /*----- Header files ------------------------------------------------------*/ |
| 28 | |
| 29 | #include "config.h" |
| 30 | |
| 31 | #include <errno.h> |
| 32 | #include <limits.h> |
| 33 | #include <stdio.h> |
| 34 | #include <stdlib.h> |
| 35 | #include <string.h> |
| 36 | |
| 37 | #include <mLib/alloc.h> |
| 38 | #include <mLib/mdwopt.h> |
| 39 | #include <mLib/quis.h> |
| 40 | #include <mLib/report.h> |
| 41 | |
| 42 | #include "checkpath.h" |
| 43 | |
| 44 | /*----- Main code ---------------------------------------------------------*/ |
| 45 | |
| 46 | /* --- @report@ --- */ |
| 47 | |
| 48 | static void report(unsigned what, int verbose, |
| 49 | const char *p, const char *msg, |
| 50 | void *arg) |
| 51 | { moan("%s", msg); } |
| 52 | |
| 53 | /* --- @usage@ --- */ |
| 54 | |
| 55 | static void usage(FILE *fp) |
| 56 | { fprintf(fp, "Usage: %s [-vqstp] [PATH...]\n", QUIS); } |
| 57 | |
| 58 | /* --- @version@ --- */ |
| 59 | |
| 60 | static void version(FILE *fp) |
| 61 | { fprintf(fp, "%s version %s\n", QUIS, VERSION); } |
| 62 | |
| 63 | /* --- @help@ --- */ |
| 64 | |
| 65 | static void help(FILE *fp) |
| 66 | { |
| 67 | version(fp); |
| 68 | putc('\n', fp); |
| 69 | usage(fp); |
| 70 | fputs("\n\ |
| 71 | Checks a path string (by default the PATH variable) for security. It\n\ |
| 72 | ensures that only `root' or the calling user can write to all the parent\n\ |
| 73 | directories of the path elements, so nobody can maliciously replace the\n\ |
| 74 | binaries unexpectedly.\n\ |
| 75 | \n\ |
| 76 | Options provided are:\n\ |
| 77 | \n\ |
| 78 | -h, --help Display this help message.\n\ |
| 79 | -V, --version Display the program's version number.\n\ |
| 80 | -u, --usage Show a terse usage summary.\n\ |
| 81 | \n\ |
| 82 | -v, --verbose Be verbose about the search progress (cumulative).\n\ |
| 83 | -q, --quiet Be quiet about the search progress (cumulative).\n\ |
| 84 | -s, --sticky Consider sticky directories secure against\n\ |
| 85 | modification by world and group (not recommended).\n\ |
| 86 | -t, --trust-group Consider other members of your group trustworthy.\n\ |
| 87 | -p, --print Write the secure path elements to standard output.\n\ |
| 88 | ", |
| 89 | fp); |
| 90 | } |
| 91 | |
| 92 | int main(int argc, char *argv[]) |
| 93 | { |
| 94 | unsigned bad = 0; |
| 95 | int i; |
| 96 | char *p, *q, *path; |
| 97 | struct checkpath cp; |
| 98 | int f = 0; |
| 99 | |
| 100 | #define f_print 1u |
| 101 | #define f_colon 2u |
| 102 | |
| 103 | /* --- Initialize the world --- */ |
| 104 | |
| 105 | ego(argv[0]); |
| 106 | |
| 107 | /* --- Set up path scanning defaults --- */ |
| 108 | |
| 109 | cp.cp_verbose = 1; |
| 110 | cp.cp_what = CP_PROBLEMS | CP_REPORT | CP_SYMLINK; |
| 111 | cp.cp_report = report; |
| 112 | cp.cp_arg = 0; |
| 113 | checkpath_setids(&cp); |
| 114 | |
| 115 | /* --- Parse the options --- */ |
| 116 | |
| 117 | for (;;) { |
| 118 | static struct option opts[] = { |
| 119 | { "help", 0, 0, 'h' }, |
| 120 | { "version", 0, 0, 'V' }, |
| 121 | { "usage", 0, 0, 'u' }, |
| 122 | { "verbose", 0, 0, 'v' }, |
| 123 | { "quiet", 0, 0, 'q' }, |
| 124 | { "sticky", 0, 0, 's' }, |
| 125 | { "trust-group", 0, 0, 't' }, |
| 126 | { "print", 0, 0, 'p' }, |
| 127 | { 0, 0, 0, 0 } |
| 128 | }; |
| 129 | int i = mdwopt(argc, argv, "hVu" "vqstp", opts, 0, 0, 0); |
| 130 | |
| 131 | if (i < 0) |
| 132 | break; |
| 133 | switch (i) { |
| 134 | case 'h': |
| 135 | help(stdout); |
| 136 | exit(0); |
| 137 | case 'V': |
| 138 | version(stdout); |
| 139 | exit(0); |
| 140 | case 'u': |
| 141 | usage(stdout); |
| 142 | exit(0); |
| 143 | case 'v': |
| 144 | cp.cp_verbose++; |
| 145 | break; |
| 146 | case 'q': |
| 147 | if (cp.cp_verbose) |
| 148 | cp.cp_verbose--; |
| 149 | break; |
| 150 | case 's': |
| 151 | cp.cp_what |= CP_STICKYOK; |
| 152 | break; |
| 153 | case 't': |
| 154 | cp.cp_what = (cp.cp_what & ~CP_WRGRP) | CP_WROTHGRP; |
| 155 | break; |
| 156 | case 'p': |
| 157 | f |= f_print; |
| 158 | break; |
| 159 | default: |
| 160 | bad = 1; |
| 161 | break; |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | if (bad) { |
| 166 | usage(stderr); |
| 167 | exit(1); |
| 168 | } |
| 169 | |
| 170 | /* --- Sort out what needs doing --- */ |
| 171 | |
| 172 | if (optind == argc) { |
| 173 | path = getenv("PATH"); |
| 174 | argv = &path; |
| 175 | argc = 1; |
| 176 | optind = 0; |
| 177 | } |
| 178 | |
| 179 | for (i = optind; i < argc; i++) { |
| 180 | p = xstrdup(argv[i]); |
| 181 | q = strtok(p, ":"); |
| 182 | while (q) { |
| 183 | unsigned b = checkpath(q, &cp); |
| 184 | if (!b && (f & f_print)) { |
| 185 | if (f & f_colon) |
| 186 | putchar(':'); |
| 187 | fputs(q, stdout); |
| 188 | f |= f_colon; |
| 189 | } |
| 190 | bad |= b; |
| 191 | q = strtok(0, ":"); |
| 192 | } |
| 193 | free(p); |
| 194 | } |
| 195 | |
| 196 | if (f & f_colon) |
| 197 | putchar('\n'); |
| 198 | |
| 199 | return (bad); |
| 200 | } |
| 201 | |
| 202 | /*----- That's all, folks -------------------------------------------------*/ |