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_VSERVER 1
38 #define ENSC_WRAPPERS_UNISTD 1
42 #define CMD_HELP 0x1000
43 #define CMD_VERSION 0x1001
45 #define CMD_SHOW 0x2000
46 #define CMD_PID 0x2001
48 #define CMD_CAP 0x4000
49 #define CMD_FLAG 0x4004
50 #define CMD_SECURE 0x4006
52 #ifdef VC_ENABLE_API_LEGACY
53 # define CMD_OBSOLETE_CHOWN 0x8000
54 # define CMD_OBSOLETE_DAC_OVERRIDE 0x8001
55 # define CMD_OBSOLETE_DAC_READ_SEARCH 0x8002
56 # define CMD_OBSOLETE_FOWNER 0x8003
57 # define CMD_OBSOLETE_FSETID 0x8004
58 # define CMD_OBSOLETE_KILL 0x8005
59 # define CMD_OBSOLETE_SETGID 0x8006
60 # define CMD_OBSOLETE_SETUID 0x8007
61 # define CMD_OBSOLETE_SETPCAP 0x8008
62 # define CMD_OBSOLETE_SYS_TTY_CONFIG 0x8009
63 # define CMD_OBSOLETE_LEASE 0x800a
64 # define CMD_OBSOLETE_SYS_CHROOT 0x800b
65 # define CMD_OBSOLETE_X_LINUX_IMMUTABLE 0x800c
66 # define CMD_OBSOLETE_X_NET_BIND_SERVICE 0x800d
67 # define CMD_OBSOLETE_X_NET_BROADCAST 0x800e
68 # define CMD_OBSOLETE_X_NET_ADMIN 0x800f
69 # define CMD_OBSOLETE_X_NET_RAW 0x8010
70 # define CMD_OBSOLETE_X_IPC_LOCK 0x8011
71 # define CMD_OBSOLETE_X_IPC_OWNER 0x8012
72 # define CMD_OBSOLETE_X_SYS_MODULE 0x8013
73 # define CMD_OBSOLETE_X_SYS_RAWIO 0x8014
74 # define CMD_OBSOLETE_X_SYS_PACCT 0x8015
75 # define CMD_OBSOLETE_X_SYS_ADMIN 0x8016
76 # define CMD_OBSOLETE_X_SYS_BOOT 0x8017
77 # define CMD_OBSOLETE_X_SYS_NICE 0x8018
78 # define CMD_OBSOLETE_X_SYS_RESOURCE 0x8019
79 # define CMD_OBSOLETE_X_SYS_TIME 0x801a
80 # define CMD_OBSOLETE_X_MKNOD 0x801b
81 # define CMD_OBSOLETE_X_QUOTACTL 0x801c
83 static char const * const OBSOLETE_MAPPING[] = {
85 "CHOWN", "DAC_OVERRIDE", "DAC_READ_SEARCH", "FOWNER",
86 "FSETID", "KILL", "SETGID", "SETUID",
87 "SETPCAP", "SYS_TTY_CONFIG", "LEASE", "SYS_CHROOT",
88 "LINUX_IMMUTABLE", "NET_BIND_SERVICE", "NET_BROADCAST", "NET_ADMIN",
89 "NET_RAW", "IPC_LOCK", "IPC_OWNER", "SYS_MODULE",
90 "SYS_RAWIO", "SYS_PACCT", "SYS_ADMIN", "SYS_BOOT",
91 "SYS_NICE", "SYS_RESOURCE", "SYS_TIME", "MKNOD",
97 { "help", no_argument, 0, CMD_HELP },
98 { "version", no_argument, 0, CMD_VERSION },
99 { "cap", required_argument, 0, CMD_CAP },
100 { "flag", required_argument, 0, CMD_FLAG },
101 { "secure", no_argument, 0, CMD_SECURE },
102 { "show", no_argument, 0, CMD_SHOW },
103 { "pid", required_argument, 0, CMD_PID },
104 #ifdef VC_ENABLE_API_LEGACY
105 { "CAP_CHOWN", no_argument, 0, CMD_OBSOLETE_CHOWN },
106 { "CAP_DAC_OVERRIDE", no_argument, 0, CMD_OBSOLETE_DAC_OVERRIDE },
107 { "CAP_DAC_READ_SEARCH", no_argument, 0, CMD_OBSOLETE_DAC_READ_SEARCH },
108 { "CAP_FOWNER", no_argument, 0, CMD_OBSOLETE_FOWNER },
109 { "CAP_FSETID", no_argument, 0, CMD_OBSOLETE_FSETID },
110 { "CAP_KILL", no_argument, 0, CMD_OBSOLETE_KILL },
111 { "CAP_SETGID", no_argument, 0, CMD_OBSOLETE_SETGID },
112 { "CAP_SETUID", no_argument, 0, CMD_OBSOLETE_SETUID },
113 { "CAP_SETPCAP", no_argument, 0, CMD_OBSOLETE_SETPCAP },
114 { "CAP_SYS_TTY_CONFIG", no_argument, 0, CMD_OBSOLETE_SYS_TTY_CONFIG },
115 { "CAP_LEASE", no_argument, 0, CMD_OBSOLETE_LEASE },
116 { "CAP_SYS_CHROOT", no_argument, 0, CMD_OBSOLETE_SYS_CHROOT },
117 { "--CAP_LINUX_IMMUTABLE", no_argument, 0, CMD_OBSOLETE_X_LINUX_IMMUTABLE },
118 { "--CAP_NET_BIND_SERVICE", no_argument, 0, CMD_OBSOLETE_X_NET_BIND_SERVICE },
119 { "--CAP_NET_BROADCAST", no_argument, 0, CMD_OBSOLETE_X_NET_BROADCAST },
120 { "--CAP_NET_ADMIN", no_argument, 0, CMD_OBSOLETE_X_NET_ADMIN },
121 { "--CAP_NET_RAW", no_argument, 0, CMD_OBSOLETE_X_NET_RAW },
122 { "--CAP_IPC_LOCK", no_argument, 0, CMD_OBSOLETE_X_IPC_LOCK },
123 { "--CAP_IPC_OWNER", no_argument, 0, CMD_OBSOLETE_X_IPC_OWNER },
124 { "--CAP_SYS_MODULE", no_argument, 0, CMD_OBSOLETE_X_SYS_MODULE },
125 { "--CAP_SYS_RAWIO", no_argument, 0, CMD_OBSOLETE_X_SYS_RAWIO },
126 { "--CAP_SYS_PACCT", no_argument, 0, CMD_OBSOLETE_X_SYS_PACCT },
127 { "--CAP_SYS_ADMIN", no_argument, 0, CMD_OBSOLETE_X_SYS_ADMIN },
128 { "--CAP_SYS_BOOT", no_argument, 0, CMD_OBSOLETE_X_SYS_BOOT },
129 { "--CAP_SYS_NICE", no_argument, 0, CMD_OBSOLETE_X_SYS_NICE },
130 { "--CAP_SYS_RESOURCE", no_argument, 0, CMD_OBSOLETE_X_SYS_RESOURCE },
131 { "--CAP_SYS_TIME", no_argument, 0, CMD_OBSOLETE_X_SYS_TIME },
132 { "--CAP_MKNOD", no_argument, 0, CMD_OBSOLETE_X_MKNOD },
133 { "--CAP_QUOTACTL", no_argument, 0, CMD_OBSOLETE_X_QUOTACTL },
138 int wrapper_exit_code = 255;
140 extern int capget (struct __user_cap_header_struct *, struct __user_cap_data_struct *);
141 extern int capset (struct __user_cap_header_struct *, struct __user_cap_data_struct *);
144 showHelp(int fd, char const *cmd, int res)
146 WRITE_MSG(fd, "Usage:\n ");
149 " [--show] [--secure] [--flag <flag>] [--cap <capability>] [--] <cmd> <args>*\n ");
152 " --show [--pid <pid>]\n\n"
153 "Please report bugs to " PACKAGE_BUGREPORT "\n");
162 "reducecap " VERSION " -- starts programs with reduced capabilities\n"
163 "This program is part of " PACKAGE_STRING "\n\n"
164 "Copyright (C) 2003,2004 Enrico Scholz\n"
165 VERSION_COPYRIGHT_DISCLAIMER);
170 printReducecap(struct __user_cap_data_struct *user)
173 WRITE_MSG(1, " Capability Effective Permitted Inheritable\n");
176 size_t const len = 23 + 10*2 + 4+2;
177 char const * text = vc_cap2text(i);
183 memset(buf, ' ', sizeof buf);
185 l = MIN(strlen(text), 22);
186 memcpy(buf, text, l);
187 buf[23 + 10*0 + 4] = (user->effective & bit) ? 'X' : ' ';
188 buf[23 + 10*1 + 4] = (user->permitted & bit) ? 'X' : ' ';
189 buf[23 + 10*2 + 4] = (user->inheritable & bit) ? 'X' : ' ';
197 struct __user_cap_header_struct header;
198 struct __user_cap_data_struct user;
199 header.version = _LINUX_CAPABILITY_VERSION;
201 if (capget(&header,&user)==-1){
203 exit(wrapper_exit_code);
206 printReducecap(&user);
210 getCap(char const *cap)
212 int bit = vc_text2cap(cap);
214 WRITE_MSG(2, "Unknown capability '");
215 WRITE_STR(2, optarg);
216 WRITE_MSG(2, "'; try '--help' for more information\n");
217 exit(wrapper_exit_code);
223 int main (int argc, char *argv[])
226 bool do_show = false;
229 bool show_obsolete_warning = true;
232 int c = getopt_long(argc, argv, "+", CMDLINE_OPTIONS, 0);
235 #ifdef VC_ENABLE_API_LEGACY
236 if (c>=CMD_OBSOLETE_CHOWN && c<=CMD_OBSOLETE_X_QUOTACTL) {
237 if (show_obsolete_warning) {
238 WRITE_MSG(2, "reducecap: warning, obsolete CLI used\n");
239 show_obsolete_warning = false;
242 remove = getCap(OBSOLETE_MAPPING[c-CMD_OBSOLETE_CHOWN]);
247 case CMD_HELP : showHelp(1, argv[0], 0);
248 case CMD_VERSION : showVersion();
249 case CMD_SECURE : remove = vc_get_securecaps(); break;
250 case CMD_SHOW : do_show = true; break;
251 case CMD_PID : pid = atoi(optarg); break;
252 case CMD_CAP : remove = getCap(optarg); break;
257 flags = vc_textlist2flag(optarg, 0, &err_ptr, &err_len);
259 WRITE_MSG(2, "Unknown flag '");
260 write(2, err_ptr, err_len);
262 exit(wrapper_exit_code);
269 if (!do_show && optind==argc) {
270 WRITE_MSG(2, "No command given; use '--help' for more information\n");
271 exit(wrapper_exit_code);
274 if (!do_show && pid!=0) {
275 WRITE_MSG(2, "A pid can be specified in '--show' mode only; use '--help' for more information\n");
276 exit(wrapper_exit_code);
279 if (do_show && optind==argc)
282 Evc_new_s_context(VC_SAMECTX, remove, flags);
283 if (do_show) show(pid);
285 WRITE_MSG(2, "Executing\n");
286 Eexecvp(argv[optind], argv+optind);