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1 /*-
2  * Copyright (c) 2006 nCircle Network Security, Inc.
3  * Copyright (c) 2007 Robert N. M. Watson
4  * All rights reserved.
5  *
6  * This software was developed by Robert N. M. Watson for the TrustedBSD
7  * Project under contract to nCircle Network Security, Inc.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY,
22  * INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
24  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
25  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  *
30  * $FreeBSD$
31  */
32
33 /*-
34  * Test that raising current resource limits above hard resource limits
35  * requires privilege.  We test three cases:
36  *
37  * - Raise the current above the maximum (privileged).
38  * - Raise the current to the maximum (unprivileged).
39  * - Raise the maximum (privileged).
40  */
41
42 #include <sys/types.h>
43 #include <sys/time.h>
44 #include <sys/resource.h>
45
46 #include <err.h>
47 #include <errno.h>
48 #include <unistd.h>
49
50 #include "main.h"
51
52 static int initialized;
53 static struct rlimit rl_base;
54 static struct rlimit rl_lowered;
55
56 int
57 priv_proc_setrlimit_setup(int asroot, int injail, struct test *test)
58 {
59
60         if (getrlimit(RLIMIT_DATA, &rl_base) < 0) {
61                 warn("priv_proc_setrlimit_setup: getrlimit");
62                 return (-1);
63         }
64
65         /*
66          * Must lower current and limit to make sure there's room to try to
67          * raise them during tests.  Set current lower than max so we can
68          * raise it later also.
69          */
70         rl_lowered = rl_base;
71         rl_lowered.rlim_cur -= 20;
72         rl_lowered.rlim_max -= 10;
73         if (setrlimit(RLIMIT_DATA, &rl_lowered) < 0) {
74                 warn("priv_proc_setrlimit_setup: setrlimit");
75                 return (-1);
76         }
77         initialized = 1;
78         return (0);
79 }
80
81 /*
82  * Try increasing the maximum limits on the process, which requires
83  * privilege.
84  */
85 void
86 priv_proc_setrlimit_raisemax(int asroot, int injail, struct test *test)
87 {
88         struct rlimit rl;
89         int error;
90
91         rl = rl_lowered;
92         rl.rlim_max = rl_base.rlim_max;
93         error = setrlimit(RLIMIT_DATA, &rl);
94         if (asroot && injail)
95                 expect("priv_proc_setrlimit_raisemax(asroot, injail)", error,
96                     0, 0);
97         if (asroot && !injail)
98                 expect("priv_proc_setrlimit_raisemax(asroot, !injail)",
99                     error, 0, 0);
100         if (!asroot && injail)
101                 expect("priv_proc_setrlimit_raisemax(!asroot, injail)",
102                     error, -1, EPERM);
103         if (!asroot && !injail)
104                 expect("priv_proc_setrlimit_raisemax(!asroot, !injail)",
105                     error, -1, EPERM);
106 }
107
108 /*
109  * Try setting the current limit to the current maximum, which is allowed
110  * without privilege.
111  */
112 void
113 priv_proc_setrlimit_raisecur_nopriv(int asroot, int injail,
114     struct test *test)
115 {
116         struct rlimit rl;
117         int error;
118
119         rl = rl_lowered;
120         rl.rlim_cur = rl.rlim_max;
121         error = setrlimit(RLIMIT_DATA, &rl);
122         if (asroot && injail)
123                 expect("priv_proc_setrlimit_raiscur_nopriv(asroot, injail)",
124                     error, 0, 0);
125         if (asroot && !injail)
126                 expect("priv_proc_setrlimit_raisecur_nopriv(asroot, !injail)",
127                     error, 0, 0);
128         if (!asroot && injail)
129                 expect("priv_proc_setrlimit_raisecur_nopriv(!asroot, injail)",
130                     error, 0, 0);
131         if (!asroot && !injail)
132                 expect("priv_proc_setrlimit_raisecur_nopriv(!asroot, !injail)",
133                     error, 0, 0);
134 }
135
136 /*
137  * Try raising the current limits above the maximum, which requires
138  * privilege.
139  */
140 void
141 priv_proc_setrlimit_raisecur(int asroot, int injail, struct test *test)
142 {
143         struct rlimit rl;
144         int error;
145
146         rl = rl_lowered;
147         rl.rlim_cur = rl.rlim_max + 10;
148         error = setrlimit(RLIMIT_DATA, &rl);
149         if (asroot && injail)
150                 expect("priv_proc_setrlimit_raisecur(asroot, injail)", error,
151                     0, 0);
152         if (asroot && !injail)
153                 expect("priv_proc_setrlimit_raisecur(asroot, !injail)",
154                     error, 0, 0);
155         if (!asroot && injail)
156                 expect("priv_proc_setrlimit_raisecur(!asroot, injail)",
157                     error, -1, EPERM);
158         if (!asroot && !injail)
159                 expect("priv_proc_setrlimit_raisecur(!asroot, !injail)",
160                     error, -1, EPERM);
161 }
162
163 void
164 priv_proc_setrlimit_cleanup(int asroot, int injail, struct test *test)
165 {
166
167         if (initialized)
168                 (void)setrlimit(RLIMIT_DATA, &rl_base);
169         initialized = 0;
170 }