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1/*
2 * os-posix.c
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 * Copyright (c) 2010 Red Hat, Inc.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23 * THE SOFTWARE.
24 */
25
d38ea87a 26#include "qemu/osdep.h"
8d963e6a 27#include <sys/wait.h>
8847cfe8 28#include <pwd.h>
cc4662f9 29#include <grp.h>
6170540b 30#include <libgen.h>
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31
32/* Needed early for CONFIG_BSD etc. */
59a5264b 33#include "net/slirp.h"
fd5fc4b1 34#include "qemu/qemu-options.h"
f853ac66 35#include "qemu/error-report.h"
96c33a45 36#include "qemu/log.h"
54d31236 37#include "sysemu/runstate.h"
f348b6d1 38#include "qemu/cutils.h"
86b645e7 39
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40#ifdef CONFIG_LINUX
41#include <sys/prctl.h>
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42#endif
43
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44/*
45 * Must set all three of these at once.
46 * Legal combinations are unset by name by uid
47 */
48static struct passwd *user_pwd; /* NULL non-NULL NULL */
49static uid_t user_uid = (uid_t)-1; /* -1 -1 >=0 */
50static gid_t user_gid = (gid_t)-1; /* -1 -1 >=0 */
51
0766379d 52static const char *chroot_dir;
eb505be1 53static int daemonize;
0be5e436 54static int daemon_pipe;
8847cfe8 55
fe98ac14 56void os_setup_early_signal_handling(void)
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57{
58 struct sigaction act;
59 sigfillset(&act.sa_mask);
60 act.sa_flags = 0;
61 act.sa_handler = SIG_IGN;
62 sigaction(SIGPIPE, &act, NULL);
63}
8d963e6a 64
f64622c4 65static void termsig_handler(int signal, siginfo_t *info, void *c)
8d963e6a 66{
f64622c4 67 qemu_system_killed(info->si_signo, info->si_pid);
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68}
69
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70void os_setup_signal_handling(void)
71{
72 struct sigaction act;
73
74 memset(&act, 0, sizeof(act));
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75 act.sa_sigaction = termsig_handler;
76 act.sa_flags = SA_SIGINFO;
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77 sigaction(SIGINT, &act, NULL);
78 sigaction(SIGHUP, &act, NULL);
79 sigaction(SIGTERM, &act, NULL);
8d963e6a 80}
6170540b 81
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82void os_set_proc_name(const char *s)
83{
84#if defined(PR_SET_NAME)
85 char name[16];
86 if (!s)
87 return;
3eadc68e 88 pstrcpy(name, sizeof(name), s);
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89 /* Could rewrite argv[0] too, but that's a bit more complicated.
90 This simple way is enough for `top'. */
91 if (prctl(PR_SET_NAME, name)) {
a7aaec14 92 error_report("unable to change process name: %s", strerror(errno));
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93 exit(1);
94 }
95#else
22cd4f48 96 error_report("Change of process name not supported by your OS");
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97 exit(1);
98#endif
99}
100
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101
102static bool os_parse_runas_uid_gid(const char *optarg)
103{
104 unsigned long lv;
105 const char *ep;
106 uid_t got_uid;
107 gid_t got_gid;
108 int rc;
109
110 rc = qemu_strtoul(optarg, &ep, 0, &lv);
111 got_uid = lv; /* overflow here is ID in C99 */
112 if (rc || *ep != ':' || got_uid != lv || got_uid == (uid_t)-1) {
113 return false;
114 }
115
116 rc = qemu_strtoul(ep + 1, 0, 0, &lv);
117 got_gid = lv; /* overflow here is ID in C99 */
118 if (rc || got_gid != lv || got_gid == (gid_t)-1) {
119 return false;
120 }
121
122 user_pwd = NULL;
123 user_uid = got_uid;
124 user_gid = got_gid;
125 return true;
126}
127
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128/*
129 * Parse OS specific command line options.
130 * return 0 if option handled, -1 otherwise
131 */
1217d6ca 132int os_parse_cmd_args(int index, const char *optarg)
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133{
134 switch (index) {
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135 case QEMU_OPTION_runas:
136 user_pwd = getpwnam(optarg);
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137 if (user_pwd) {
138 user_uid = -1;
139 user_gid = -1;
140 } else if (!os_parse_runas_uid_gid(optarg)) {
141 error_report("User \"%s\" doesn't exist"
142 " (and is not <uid>:<gid>)",
143 optarg);
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144 exit(1);
145 }
146 break;
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147 case QEMU_OPTION_chroot:
148 chroot_dir = optarg;
149 break;
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150 case QEMU_OPTION_daemonize:
151 daemonize = 1;
152 break;
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153 default:
154 return -1;
59a5264b 155 }
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156
157 return 0;
59a5264b 158}
8847cfe8 159
e06eb601 160static void change_process_uid(void)
8847cfe8 161{
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162 assert((user_uid == (uid_t)-1) || user_pwd == NULL);
163 assert((user_uid == (uid_t)-1) ==
164 (user_gid == (gid_t)-1));
165
166 if (user_pwd || user_uid != (uid_t)-1) {
167 gid_t intended_gid = user_pwd ? user_pwd->pw_gid : user_gid;
168 uid_t intended_uid = user_pwd ? user_pwd->pw_uid : user_uid;
169 if (setgid(intended_gid) < 0) {
170 error_report("Failed to setgid(%d)", intended_gid);
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171 exit(1);
172 }
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173 if (user_pwd) {
174 if (initgroups(user_pwd->pw_name, user_pwd->pw_gid) < 0) {
175 error_report("Failed to initgroups(\"%s\", %d)",
176 user_pwd->pw_name, user_pwd->pw_gid);
177 exit(1);
178 }
179 } else {
180 if (setgroups(1, &user_gid) < 0) {
181 error_report("Failed to setgroups(1, [%d])",
182 user_gid);
183 exit(1);
184 }
cc4662f9 185 }
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186 if (setuid(intended_uid) < 0) {
187 error_report("Failed to setuid(%d)", intended_uid);
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188 exit(1);
189 }
190 if (setuid(0) != -1) {
f0a2171b 191 error_report("Dropping privileges failed");
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192 exit(1);
193 }
194 }
195}
0766379d 196
e06eb601 197static void change_root(void)
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198{
199 if (chroot_dir) {
200 if (chroot(chroot_dir) < 0) {
22cd4f48 201 error_report("chroot failed");
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202 exit(1);
203 }
204 if (chdir("/")) {
a7aaec14 205 error_report("not able to chdir to /: %s", strerror(errno));
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206 exit(1);
207 }
208 }
209
210}
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211
212void os_daemonize(void)
213{
214 if (daemonize) {
63ce8e15 215 pid_t pid;
0be5e436 216 int fds[2];
eb505be1 217
3338a41f 218 if (!g_unix_open_pipe(fds, FD_CLOEXEC, NULL)) {
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219 exit(1);
220 }
eb505be1 221
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222 pid = fork();
223 if (pid > 0) {
224 uint8_t status;
225 ssize_t len;
eb505be1 226
63ce8e15 227 close(fds[1]);
eb505be1 228
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229 do {
230 len = read(fds[0], &status, 1);
231 } while (len < 0 && errno == EINTR);
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232
233 /* only exit successfully if our child actually wrote
234 * a one-byte zero to our pipe, upon successful init */
235 exit(len == 1 && status == 0 ? 0 : 1);
236
237 } else if (pid < 0) {
238 exit(1);
239 }
eb505be1 240
63ce8e15 241 close(fds[0]);
0be5e436 242 daemon_pipe = fds[1];
eb505be1 243
63ce8e15 244 setsid();
eb505be1 245
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246 pid = fork();
247 if (pid > 0) {
248 exit(0);
249 } else if (pid < 0) {
250 exit(1);
251 }
252 umask(027);
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253
254 signal(SIGTSTP, SIG_IGN);
255 signal(SIGTTOU, SIG_IGN);
256 signal(SIGTTIN, SIG_IGN);
257 }
258}
259
260void os_setup_post(void)
261{
262 int fd = 0;
263
264 if (daemonize) {
eb505be1 265 if (chdir("/")) {
a7aaec14 266 error_report("not able to chdir to /: %s", strerror(errno));
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267 exit(1);
268 }
448058aa 269 TFR(fd = qemu_open_old("/dev/null", O_RDWR));
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270 if (fd == -1) {
271 exit(1);
272 }
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273 }
274
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275 change_root();
276 change_process_uid();
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277
278 if (daemonize) {
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279 uint8_t status = 0;
280 ssize_t len;
281
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282 dup2(fd, 0);
283 dup2(fd, 1);
96c33a45 284 /* In case -D is given do not redirect stderr to /dev/null */
229ef2eb 285 if (!qemu_log_enabled()) {
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286 dup2(fd, 2);
287 }
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288
289 close(fd);
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290
291 do {
292 len = write(daemon_pipe, &status, 1);
293 } while (len < 0 && errno == EINTR);
294 if (len != 1) {
295 exit(1);
296 }
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297 }
298}
299
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300void os_set_line_buffering(void)
301{
302 setvbuf(stdout, NULL, _IOLBF, 0);
303}
949d31e6 304
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305bool is_daemonized(void)
306{
307 return daemonize;
308}
888a6bc6 309
f22ac472
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310int os_set_daemonize(bool d)
311{
312 daemonize = d;
313 return 0;
314}
315
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316int os_mlock(void)
317{
195588cc 318#ifdef HAVE_MLOCKALL
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319 int ret = 0;
320
321 ret = mlockall(MCL_CURRENT | MCL_FUTURE);
322 if (ret < 0) {
a7aaec14 323 error_report("mlockall: %s", strerror(errno));
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324 }
325
326 return ret;
195588cc
DC
327#else
328 return -ENOSYS;
329#endif
888a6bc6 330}