3 // Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
4 // based on reducecap.cc by Jacques Gelinas
6 // This program is free software; you can redistribute it and/or modify
7 // it under the terms of the GNU General Public License as published by
8 // the Free Software Foundation; either version 2, or (at your option)
11 // This program is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License
17 // along with this program; if not, write to the Free Software
18 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
33 #include <sys/param.h>
35 #include "linuxcaps.h"
37 #define ENSC_WRAPPERS_PREFIX "reducecap: "
38 #define ENSC_WRAPPERS_VSERVER 1
39 #define ENSC_WRAPPERS_UNISTD 1
43 #define CMD_HELP 0x1000
44 #define CMD_VERSION 0x1001
46 #define CMD_SHOW 0x2000
47 #define CMD_PID 0x2001
49 #define CMD_CAP 0x4000
50 #define CMD_FLAG 0x4004
51 #define CMD_SECURE 0x4006
53 #ifdef VC_ENABLE_API_LEGACY
54 # define CMD_OBSOLETE_CHOWN 0x8000
55 # define CMD_OBSOLETE_DAC_OVERRIDE 0x8001
56 # define CMD_OBSOLETE_DAC_READ_SEARCH 0x8002
57 # define CMD_OBSOLETE_FOWNER 0x8003
58 # define CMD_OBSOLETE_FSETID 0x8004
59 # define CMD_OBSOLETE_KILL 0x8005
60 # define CMD_OBSOLETE_SETGID 0x8006
61 # define CMD_OBSOLETE_SETUID 0x8007
62 # define CMD_OBSOLETE_SETPCAP 0x8008
63 # define CMD_OBSOLETE_SYS_TTY_CONFIG 0x8009
64 # define CMD_OBSOLETE_LEASE 0x800a
65 # define CMD_OBSOLETE_SYS_CHROOT 0x800b
66 # define CMD_OBSOLETE_X_LINUX_IMMUTABLE 0x800c
67 # define CMD_OBSOLETE_X_NET_BIND_SERVICE 0x800d
68 # define CMD_OBSOLETE_X_NET_BROADCAST 0x800e
69 # define CMD_OBSOLETE_X_NET_ADMIN 0x800f
70 # define CMD_OBSOLETE_X_NET_RAW 0x8010
71 # define CMD_OBSOLETE_X_IPC_LOCK 0x8011
72 # define CMD_OBSOLETE_X_IPC_OWNER 0x8012
73 # define CMD_OBSOLETE_X_SYS_MODULE 0x8013
74 # define CMD_OBSOLETE_X_SYS_RAWIO 0x8014
75 # define CMD_OBSOLETE_X_SYS_PACCT 0x8015
76 # define CMD_OBSOLETE_X_SYS_ADMIN 0x8016
77 # define CMD_OBSOLETE_X_SYS_BOOT 0x8017
78 # define CMD_OBSOLETE_X_SYS_NICE 0x8018
79 # define CMD_OBSOLETE_X_SYS_RESOURCE 0x8019
80 # define CMD_OBSOLETE_X_SYS_TIME 0x801a
81 # define CMD_OBSOLETE_X_MKNOD 0x801b
82 # define CMD_OBSOLETE_X_QUOTACTL 0x801c
84 static char const * const OBSOLETE_MAPPING[] = {
86 "CHOWN", "DAC_OVERRIDE", "DAC_READ_SEARCH", "FOWNER",
87 "FSETID", "KILL", "SETGID", "SETUID",
88 "SETPCAP", "SYS_TTY_CONFIG", "LEASE", "SYS_CHROOT",
89 "LINUX_IMMUTABLE", "NET_BIND_SERVICE", "NET_BROADCAST", "NET_ADMIN",
90 "NET_RAW", "IPC_LOCK", "IPC_OWNER", "SYS_MODULE",
91 "SYS_RAWIO", "SYS_PACCT", "SYS_ADMIN", "SYS_BOOT",
92 "SYS_NICE", "SYS_RESOURCE", "SYS_TIME", "MKNOD",
98 { "help", no_argument, 0, CMD_HELP },
99 { "version", no_argument, 0, CMD_VERSION },
100 { "cap", required_argument, 0, CMD_CAP },
101 { "flag", required_argument, 0, CMD_FLAG },
102 { "secure", no_argument, 0, CMD_SECURE },
103 { "show", no_argument, 0, CMD_SHOW },
104 { "pid", required_argument, 0, CMD_PID },
105 #ifdef VC_ENABLE_API_LEGACY
106 { "CAP_CHOWN", no_argument, 0, CMD_OBSOLETE_CHOWN },
107 { "CAP_DAC_OVERRIDE", no_argument, 0, CMD_OBSOLETE_DAC_OVERRIDE },
108 { "CAP_DAC_READ_SEARCH", no_argument, 0, CMD_OBSOLETE_DAC_READ_SEARCH },
109 { "CAP_FOWNER", no_argument, 0, CMD_OBSOLETE_FOWNER },
110 { "CAP_FSETID", no_argument, 0, CMD_OBSOLETE_FSETID },
111 { "CAP_KILL", no_argument, 0, CMD_OBSOLETE_KILL },
112 { "CAP_SETGID", no_argument, 0, CMD_OBSOLETE_SETGID },
113 { "CAP_SETUID", no_argument, 0, CMD_OBSOLETE_SETUID },
114 { "CAP_SETPCAP", no_argument, 0, CMD_OBSOLETE_SETPCAP },
115 { "CAP_SYS_TTY_CONFIG", no_argument, 0, CMD_OBSOLETE_SYS_TTY_CONFIG },
116 { "CAP_LEASE", no_argument, 0, CMD_OBSOLETE_LEASE },
117 { "CAP_SYS_CHROOT", no_argument, 0, CMD_OBSOLETE_SYS_CHROOT },
118 { "--CAP_LINUX_IMMUTABLE", no_argument, 0, CMD_OBSOLETE_X_LINUX_IMMUTABLE },
119 { "--CAP_NET_BIND_SERVICE", no_argument, 0, CMD_OBSOLETE_X_NET_BIND_SERVICE },
120 { "--CAP_NET_BROADCAST", no_argument, 0, CMD_OBSOLETE_X_NET_BROADCAST },
121 { "--CAP_NET_ADMIN", no_argument, 0, CMD_OBSOLETE_X_NET_ADMIN },
122 { "--CAP_NET_RAW", no_argument, 0, CMD_OBSOLETE_X_NET_RAW },
123 { "--CAP_IPC_LOCK", no_argument, 0, CMD_OBSOLETE_X_IPC_LOCK },
124 { "--CAP_IPC_OWNER", no_argument, 0, CMD_OBSOLETE_X_IPC_OWNER },
125 { "--CAP_SYS_MODULE", no_argument, 0, CMD_OBSOLETE_X_SYS_MODULE },
126 { "--CAP_SYS_RAWIO", no_argument, 0, CMD_OBSOLETE_X_SYS_RAWIO },
127 { "--CAP_SYS_PACCT", no_argument, 0, CMD_OBSOLETE_X_SYS_PACCT },
128 { "--CAP_SYS_ADMIN", no_argument, 0, CMD_OBSOLETE_X_SYS_ADMIN },
129 { "--CAP_SYS_BOOT", no_argument, 0, CMD_OBSOLETE_X_SYS_BOOT },
130 { "--CAP_SYS_NICE", no_argument, 0, CMD_OBSOLETE_X_SYS_NICE },
131 { "--CAP_SYS_RESOURCE", no_argument, 0, CMD_OBSOLETE_X_SYS_RESOURCE },
132 { "--CAP_SYS_TIME", no_argument, 0, CMD_OBSOLETE_X_SYS_TIME },
133 { "--CAP_MKNOD", no_argument, 0, CMD_OBSOLETE_X_MKNOD },
134 { "--CAP_QUOTACTL", no_argument, 0, CMD_OBSOLETE_X_QUOTACTL },
139 int wrapper_exit_code = 255;
141 extern int capget (struct __user_cap_header_struct *, struct __user_cap_data_struct *);
142 extern int capset (struct __user_cap_header_struct *, struct __user_cap_data_struct *);
145 showHelp(int fd, char const *cmd, int res)
147 WRITE_MSG(fd, "Usage:\n ");
150 " [--show] [--secure] [--flag <flag>] [--cap <capability>] [--] <cmd> <args>*\n ");
153 " --show [--pid <pid>]\n\n"
154 "Please report bugs to " PACKAGE_BUGREPORT "\n");
163 "reducecap " VERSION " -- starts programs with reduced capabilities\n"
164 "This program is part of " PACKAGE_STRING "\n\n"
165 "Copyright (C) 2003,2004 Enrico Scholz\n"
166 VERSION_COPYRIGHT_DISCLAIMER);
171 printReducecap(struct __user_cap_data_struct *user)
174 WRITE_MSG(1, " Capability Effective Permitted Inheritable\n");
177 size_t const len = 23 + 10*2 + 4+2;
178 char const * text = vc_cap2text(i);
184 memset(buf, ' ', sizeof buf);
186 l = MIN(strlen(text), 22);
187 memcpy(buf, text, l);
188 buf[23 + 10*0 + 4] = (user->effective & bit) ? 'X' : ' ';
189 buf[23 + 10*1 + 4] = (user->permitted & bit) ? 'X' : ' ';
190 buf[23 + 10*2 + 4] = (user->inheritable & bit) ? 'X' : ' ';
198 struct __user_cap_header_struct header;
199 struct __user_cap_data_struct user;
200 header.version = _LINUX_CAPABILITY_VERSION;
202 if (capget(&header,&user)==-1){
203 perror ("reducecap: capget()");
204 exit(wrapper_exit_code);
207 printReducecap(&user);
211 getCap(char const *cap)
213 int bit = vc_text2cap(cap);
215 WRITE_MSG(2, "Unknown capability '");
216 WRITE_STR(2, optarg);
217 WRITE_MSG(2, "'; try '--help' for more information\n");
218 exit(wrapper_exit_code);
224 int main (int argc, char *argv[])
227 bool do_show = false;
230 #ifdef VC_ENABLE_API_LEGACY
231 bool show_obsolete_warning = true;
235 int c = getopt_long(argc, argv, "+", CMDLINE_OPTIONS, 0);
238 #ifdef VC_ENABLE_API_LEGACY
239 if (c>=CMD_OBSOLETE_CHOWN && c<=CMD_OBSOLETE_X_QUOTACTL) {
240 if (show_obsolete_warning) {
241 WRITE_MSG(2, "reducecap: warning, obsolete CLI used\n");
242 show_obsolete_warning = false;
245 remove = getCap(OBSOLETE_MAPPING[c-CMD_OBSOLETE_CHOWN]);
250 case CMD_HELP : showHelp(1, argv[0], 0);
251 case CMD_VERSION : showVersion();
252 case CMD_SECURE : remove = vc_get_insecurecaps(); break;
253 case CMD_SHOW : do_show = true; break;
254 case CMD_PID : pid = atoi(optarg); break;
255 case CMD_CAP : remove = getCap(optarg); break;
257 struct vc_err_listparser err;
259 flags = vc_list2cflag_compat(optarg, 0, &err);
261 WRITE_MSG(2, "Unknown flag '");
262 write(2, err.ptr, err.len);
264 exit(wrapper_exit_code);
271 if (!do_show && optind==argc) {
272 WRITE_MSG(2, "No command given; use '--help' for more information\n");
273 exit(wrapper_exit_code);
276 if (!do_show && pid!=0) {
277 WRITE_MSG(2, "A pid can be specified in '--show' mode only; use '--help' for more information\n");
278 exit(wrapper_exit_code);
281 if (do_show && optind==argc)
284 Evc_new_s_context(VC_SAMECTX, remove, flags);
285 if (do_show) show(pid);
287 WRITE_MSG(2, "Executing\n");
288 Eexecvp(argv[optind], argv+optind);