efa7a97b |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: chkpath.c,v 1.1 1999/04/06 20:12:07 mdw Exp $ |
4 | * |
5 | * Check a user's file search path |
6 | * |
7 | * (c) 1999 Mark Wooding |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of chkpath. |
13 | * |
14 | * chkpath is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * chkpath is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with chkpath; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: chkpath.c,v $ |
32 | * Revision 1.1 1999/04/06 20:12:07 mdw |
33 | * Initial revision |
34 | * |
35 | */ |
36 | |
37 | /*----- Header files ------------------------------------------------------*/ |
38 | |
39 | #include <errno.h> |
40 | #include <limits.h> |
41 | #include <stdio.h> |
42 | #include <stdlib.h> |
43 | #include <string.h> |
44 | |
45 | #include <mLib/alloc.h> |
46 | #include <mLib/mdwopt.h> |
47 | #include <mLib/quis.h> |
48 | #include <mLib/report.h> |
49 | |
50 | #include "path.h" |
51 | |
52 | /*----- Main code ---------------------------------------------------------*/ |
53 | |
54 | static void report(int what, int verbose, |
55 | const char *p, const char *msg, |
56 | void *arg) |
57 | { |
58 | moan("%s", msg); |
59 | } |
60 | |
61 | /* --- @usage@ --- */ |
62 | |
63 | static void usage(FILE *fp) |
64 | { |
65 | fprintf(fp, "Usage: %s [-vqstp] [PATH...]\n", QUIS); |
66 | } |
67 | |
68 | /* --- @version@ --- */ |
69 | |
70 | static void version(FILE *fp) |
71 | { |
72 | fprintf(fp, "%s version %s\n", QUIS, VERSION); |
73 | } |
74 | |
75 | /* --- @help@ --- */ |
76 | |
77 | static void help(FILE *fp) |
78 | { |
79 | version(fp); |
80 | putc('\n', fp); |
81 | usage(fp); |
82 | fputs("\n\ |
83 | Checks a path string (by default the PATH variable) for security. It\n\ |
84 | ensures that only `root' or the calling user can write to all the parent\n\ |
85 | directories of the path elements, so nobody can maliciously replace the\n\ |
86 | binaries unexpectedly.\n\ |
87 | \n\ |
88 | Options provided are:\n\ |
89 | \n\ |
90 | -h, --help Display this help message.\n\ |
91 | -V, --version Display the program's version number.\n\ |
92 | -u, --usage Show a terse usage summary.\n\ |
93 | \n\ |
94 | -v, --verbose Be verbose about the search progress (cumulative).\n\ |
95 | -q, --quiet Be quiet about the search progress (cumulative).\n\ |
96 | -s, --sticky Consider sticky directories secure against\n\ |
97 | modification by world and group (not recommended).\n\ |
98 | -t, --trust-group Consider other members of your group trustworthy.\n\ |
99 | -p, --print Write the secure path elements to standard output.\n\ |
100 | ", |
101 | fp); |
102 | } |
103 | |
104 | int main(int argc, char *argv[]) |
105 | { |
106 | int bad = 0; |
107 | int i; |
108 | char *p, *q, *path; |
109 | struct chkpath cp; |
110 | int f = 0; |
111 | |
112 | enum { |
113 | f_print = 1, |
114 | f_colon = 2 |
115 | }; |
116 | |
117 | /* --- Initialize the world --- */ |
118 | |
119 | ego(argv[0]); |
120 | |
121 | /* --- Set up path scanning defaults --- */ |
122 | |
123 | cp.cp_verbose = 1; |
124 | cp.cp_what = (CP_WRWORLD | CP_WRGRP | CP_WROTHUSR | |
125 | CP_ERROR | CP_REPORT | CP_SYMLINK); |
126 | cp.cp_report = report; |
127 | cp.cp_arg = 0; |
128 | path_setids(&cp); |
129 | |
130 | /* --- Parse the options --- */ |
131 | |
132 | for (;;) { |
133 | static struct option opts[] = { |
134 | { "help", 0, 0, 'h' }, |
135 | { "version", 0, 0, 'V' }, |
136 | { "usage", 0, 0, 'u' }, |
137 | { "verbose", 0, 0, 'v' }, |
138 | { "quiet", 0, 0, 'q' }, |
139 | { "sticky", 0, 0, 's' }, |
140 | { "trust-group", 0, 0, 't' }, |
141 | { "print", 0, 0, 'p' }, |
142 | { 0, 0, 0, 0 } |
143 | }; |
144 | int i = mdwopt(argc, argv, "hVu vqstp", opts, 0, 0, 0); |
145 | |
146 | if (i < 0) |
147 | break; |
148 | switch (i) { |
149 | case 'h': |
150 | help(stdout); |
151 | exit(0); |
152 | case 'V': |
153 | version(stdout); |
154 | exit(0); |
155 | case 'u': |
156 | usage(stdout); |
157 | exit(0); |
158 | case 'v': |
159 | cp.cp_verbose++; |
160 | break; |
161 | case 'q': |
162 | if (cp.cp_verbose) |
163 | cp.cp_verbose--; |
164 | break; |
165 | case 's': |
166 | cp.cp_what |= CP_STICKYOK; |
167 | break; |
168 | case 't': |
169 | cp.cp_what = (cp.cp_what & ~CP_WRGRP) | CP_WROTHGRP; |
170 | break; |
171 | case 'p': |
172 | f |= f_print; |
173 | break; |
174 | default: |
175 | bad = 1; |
176 | break; |
177 | } |
178 | } |
179 | |
180 | if (bad) { |
181 | usage(stderr); |
182 | exit(1); |
183 | } |
184 | |
185 | /* --- Sort out what needs doing --- */ |
186 | |
187 | if (optind == argc) { |
188 | path = getenv("PATH"); |
189 | argv = &path; |
190 | argc = 1; |
191 | optind = 0; |
192 | } |
193 | |
194 | for (i = optind; i < argc; i++) { |
195 | p = xstrdup(argv[i]); |
196 | q = strtok(p, ":"); |
197 | while (q) { |
198 | int b = path_check(q, &cp); |
199 | if (!b && (f & f_print)) { |
200 | if (f & f_colon) |
201 | putchar(':'); |
202 | fputs(q, stdout); |
203 | f |= f_colon; |
204 | } |
205 | bad |= b; |
206 | q = strtok(0, ":"); |
207 | } |
208 | free(p); |
209 | } |
210 | |
211 | if (f & f_colon) |
212 | putchar('\n'); |
213 | |
214 | return (bad); |
215 | } |
216 | |
217 | /*----- That's all, folks -------------------------------------------------*/ |