Commit | Line | Data |
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efa7a97b | 1 | /* -*-c-*- |
efa7a97b | 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 | ||
efa7a97b | 27 | /*----- Header files ------------------------------------------------------*/ |
28 | ||
29 | #include <errno.h> | |
30 | #include <limits.h> | |
31 | #include <stdio.h> | |
32 | #include <stdlib.h> | |
33 | #include <string.h> | |
34 | ||
35 | #include <mLib/alloc.h> | |
36 | #include <mLib/mdwopt.h> | |
37 | #include <mLib/quis.h> | |
38 | #include <mLib/report.h> | |
39 | ||
d7b5ee0c | 40 | #include "checkpath.h" |
efa7a97b | 41 | |
42 | /*----- Main code ---------------------------------------------------------*/ | |
43 | ||
d8e11317 MW |
44 | /* --- @report@ --- */ |
45 | ||
d7b5ee0c | 46 | static void report(unsigned what, int verbose, |
efa7a97b | 47 | const char *p, const char *msg, |
48 | void *arg) | |
d8e11317 | 49 | { moan("%s", msg); } |
efa7a97b | 50 | |
51 | /* --- @usage@ --- */ | |
52 | ||
53 | static void usage(FILE *fp) | |
d8e11317 | 54 | { fprintf(fp, "Usage: %s [-vqstp] [PATH...]\n", QUIS); } |
efa7a97b | 55 | |
56 | /* --- @version@ --- */ | |
57 | ||
58 | static void version(FILE *fp) | |
d8e11317 | 59 | { fprintf(fp, "%s version %s\n", QUIS, VERSION); } |
efa7a97b | 60 | |
61 | /* --- @help@ --- */ | |
62 | ||
63 | static void help(FILE *fp) | |
64 | { | |
65 | version(fp); | |
66 | putc('\n', fp); | |
67 | usage(fp); | |
68 | fputs("\n\ | |
69 | Checks a path string (by default the PATH variable) for security. It\n\ | |
70 | ensures that only `root' or the calling user can write to all the parent\n\ | |
71 | directories of the path elements, so nobody can maliciously replace the\n\ | |
72 | binaries unexpectedly.\n\ | |
73 | \n\ | |
74 | Options provided are:\n\ | |
75 | \n\ | |
76 | -h, --help Display this help message.\n\ | |
77 | -V, --version Display the program's version number.\n\ | |
78 | -u, --usage Show a terse usage summary.\n\ | |
79 | \n\ | |
80 | -v, --verbose Be verbose about the search progress (cumulative).\n\ | |
81 | -q, --quiet Be quiet about the search progress (cumulative).\n\ | |
82 | -s, --sticky Consider sticky directories secure against\n\ | |
83 | modification by world and group (not recommended).\n\ | |
84 | -t, --trust-group Consider other members of your group trustworthy.\n\ | |
85 | -p, --print Write the secure path elements to standard output.\n\ | |
86 | ", | |
87 | fp); | |
88 | } | |
89 | ||
90 | int main(int argc, char *argv[]) | |
91 | { | |
d7b5ee0c | 92 | unsigned bad = 0; |
efa7a97b | 93 | int i; |
94 | char *p, *q, *path; | |
d7b5ee0c | 95 | struct checkpath cp; |
efa7a97b | 96 | int f = 0; |
97 | ||
7868d789 | 98 | #define f_print 1u |
99 | #define f_colon 2u | |
efa7a97b | 100 | |
101 | /* --- Initialize the world --- */ | |
102 | ||
103 | ego(argv[0]); | |
104 | ||
105 | /* --- Set up path scanning defaults --- */ | |
106 | ||
107 | cp.cp_verbose = 1; | |
d7b5ee0c | 108 | cp.cp_what = CP_PROBLEMS | CP_REPORT | CP_SYMLINK; |
efa7a97b | 109 | cp.cp_report = report; |
110 | cp.cp_arg = 0; | |
d7b5ee0c | 111 | checkpath_setids(&cp); |
efa7a97b | 112 | |
113 | /* --- Parse the options --- */ | |
114 | ||
115 | for (;;) { | |
116 | static struct option opts[] = { | |
117 | { "help", 0, 0, 'h' }, | |
118 | { "version", 0, 0, 'V' }, | |
119 | { "usage", 0, 0, 'u' }, | |
120 | { "verbose", 0, 0, 'v' }, | |
121 | { "quiet", 0, 0, 'q' }, | |
122 | { "sticky", 0, 0, 's' }, | |
123 | { "trust-group", 0, 0, 't' }, | |
124 | { "print", 0, 0, 'p' }, | |
125 | { 0, 0, 0, 0 } | |
126 | }; | |
127 | int i = mdwopt(argc, argv, "hVu vqstp", opts, 0, 0, 0); | |
128 | ||
129 | if (i < 0) | |
130 | break; | |
131 | switch (i) { | |
132 | case 'h': | |
133 | help(stdout); | |
134 | exit(0); | |
135 | case 'V': | |
136 | version(stdout); | |
137 | exit(0); | |
138 | case 'u': | |
139 | usage(stdout); | |
140 | exit(0); | |
141 | case 'v': | |
142 | cp.cp_verbose++; | |
143 | break; | |
144 | case 'q': | |
145 | if (cp.cp_verbose) | |
146 | cp.cp_verbose--; | |
147 | break; | |
148 | case 's': | |
149 | cp.cp_what |= CP_STICKYOK; | |
150 | break; | |
151 | case 't': | |
152 | cp.cp_what = (cp.cp_what & ~CP_WRGRP) | CP_WROTHGRP; | |
153 | break; | |
154 | case 'p': | |
155 | f |= f_print; | |
156 | break; | |
157 | default: | |
158 | bad = 1; | |
159 | break; | |
160 | } | |
161 | } | |
162 | ||
163 | if (bad) { | |
164 | usage(stderr); | |
165 | exit(1); | |
166 | } | |
167 | ||
168 | /* --- Sort out what needs doing --- */ | |
169 | ||
170 | if (optind == argc) { | |
171 | path = getenv("PATH"); | |
172 | argv = &path; | |
173 | argc = 1; | |
174 | optind = 0; | |
175 | } | |
176 | ||
177 | for (i = optind; i < argc; i++) { | |
178 | p = xstrdup(argv[i]); | |
179 | q = strtok(p, ":"); | |
180 | while (q) { | |
d7b5ee0c | 181 | unsigned b = checkpath(q, &cp); |
efa7a97b | 182 | if (!b && (f & f_print)) { |
183 | if (f & f_colon) | |
184 | putchar(':'); | |
185 | fputs(q, stdout); | |
186 | f |= f_colon; | |
187 | } | |
188 | bad |= b; | |
189 | q = strtok(0, ":"); | |
190 | } | |
191 | free(p); | |
192 | } | |
193 | ||
194 | if (f & f_colon) | |
195 | putchar('\n'); | |
196 | ||
197 | return (bad); | |
198 | } | |
199 | ||
200 | /*----- That's all, folks -------------------------------------------------*/ |