void network_set_run_file(pid_t pid) {
char *fname;
if (asprintf(&fname, "%s/%d-netmap", RUN_FIREJAIL_NETWORK_DIR, (int) pid) == -1)
errExit("asprintf");
// create an empty file and set mod and ownership
FILE *fp = fopen(fname, "w");
if (fp) {
if (cfg.bridge0.configured)
fprintf(fp, "%s:%s\n", cfg.bridge0.dev, cfg.bridge0.devsandbox);
if (cfg.bridge1.configured)
fprintf(fp, "%s:%s\n", cfg.bridge1.dev, cfg.bridge1.devsandbox);
if (cfg.bridge2.configured)
fprintf(fp, "%s:%s\n", cfg.bridge2.dev, cfg.bridge2.devsandbox);
if (cfg.bridge3.configured)
fprintf(fp, "%s:%s\n", cfg.bridge3.dev, cfg.bridge3.devsandbox);
SET_PERMS_STREAM(fp, 0, 0, 0644);
fclose(fp);
}
else {
fprintf(stderr, "Error: cannot create network map file\n");
exit(1);
}
free(fname);
}
void fs_trace(void) {
// create the new ld.so.preload file and mount-bind it
if (arg_debug)
printf("Create the new ld.so.preload file\n");
FILE *fp = fopen(RUN_LDPRELOAD_FILE, "w");
if (!fp)
errExit("fopen");
const char *prefix = RUN_FIREJAIL_LIB_DIR;
if (arg_trace) {
fprintf(fp, "%s/libtrace.so\n", prefix);
}
else if (arg_tracelog) {
fprintf(fp, "%s/libtracelog.so\n", prefix);
fmessage("Blacklist violations are logged to syslog\n");
}
if (arg_seccomp_postexec) {
fprintf(fp, "%s/libpostexecseccomp.so\n", prefix);
fmessage("Post-exec seccomp protector enabled\n");
}
SET_PERMS_STREAM(fp, 0, 0, S_IRUSR | S_IWRITE | S_IRGRP | S_IROTH);
fclose(fp);
// mount the new preload file
if (arg_debug)
printf("Mount the new ld.so.preload file\n");
if (mount(RUN_LDPRELOAD_FILE, "/etc/ld.so.preload", NULL, MS_BIND|MS_REC, NULL) < 0)
errExit("mount bind ld.so.preload");
fs_logger("create /etc/ld.so.preload");
}
//***********************************
// run file handling
//***********************************
static void bandwidth_create_run_file(pid_t pid) {
char *fname;
if (asprintf(&fname, "%s/%d-bandwidth", RUN_FIREJAIL_BANDWIDTH_DIR, (int) pid) == -1)
errExit("asprintf");
// if the file already exists, do nothing
struct stat s;
if (stat(fname, &s) == 0) {
free(fname);
return;
}
// create an empty file and set mod and ownership
/* coverity[toctou] */
FILE *fp = fopen(fname, "w");
if (fp) {
SET_PERMS_STREAM(fp, 0, 0, 0644);
fclose(fp);
}
else {
fprintf(stderr, "Error: cannot create bandwidth file\n");
exit(1);
}
free(fname);
}
void fs_x11(void) {
#ifdef HAVE_X11
int display = x11_display();
if (display <= 0)
return;
char *x11file;
if (asprintf(&x11file, "/tmp/.X11-unix/X%d", display) == -1)
errExit("asprintf");
struct stat s;
if (stat(x11file, &s) == -1)
return;
// keep a copy of real /tmp/.X11-unix directory in WHITELIST_TMP_DIR
int rv = mkdir(RUN_WHITELIST_X11_DIR, 1777);
if (rv == -1)
errExit("mkdir");
if (chown(RUN_WHITELIST_X11_DIR, 0, 0) < 0)
errExit("chown");
if (chmod(RUN_WHITELIST_X11_DIR, 1777) < 0)
errExit("chmod");
if (mount("/tmp/.X11-unix", RUN_WHITELIST_X11_DIR, NULL, MS_BIND|MS_REC, NULL) < 0)
errExit("mount bind");
// mount tmpfs on /tmp/.X11-unix
if (arg_debug || arg_debug_whitelists)
printf("Mounting tmpfs on /tmp/.X11-unix directory\n");
if (mount("tmpfs", "/tmp/.X11-unix", "tmpfs", MS_NOSUID | MS_STRICTATIME | MS_REC, "mode=1777,gid=0") < 0)
errExit("mounting tmpfs on /tmp");
fs_logger("tmpfs /tmp/.X11-unix");
// create an empty file
FILE *fp = fopen(x11file, "w");
if (!fp) {
fprintf(stderr, "Error: cannot create empty file in x11 directory\n");
exit(1);
}
// set file properties
SET_PERMS_STREAM(fp, s.st_uid, s.st_gid, s.st_mode);
fclose(fp);
// mount
char *wx11file;
if (asprintf(&wx11file, "%s/X%d", RUN_WHITELIST_X11_DIR, display) == -1)
errExit("asprintf");
if (mount(wx11file, x11file, NULL, MS_BIND|MS_REC, NULL) < 0)
errExit("mount bind");
fs_logger2("whitelist", x11file);
free(x11file);
free(wx11file);
// block access to RUN_WHITELIST_X11_DIR
if (mount(RUN_RO_DIR, RUN_WHITELIST_X11_DIR, "none", MS_BIND, "mode=400,gid=0") == -1)
errExit("mount");
fs_logger2("blacklist", RUN_WHITELIST_X11_DIR);
#endif
}
void fs_var_log(void) {
build_list("/var/log");
// note: /var/log is not created here, if it does not exist, this section fails.
// create /var/log if it doesn't exit
if (is_dir("/var/log")) {
// extract group id for /var/log/wtmp
struct stat s;
gid_t wtmp_group = 0;
if (stat("/var/log/wtmp", &s) == 0)
wtmp_group = s.st_gid;
// mount a tmpfs on top of /var/log
if (arg_debug)
printf("Mounting tmpfs on /var/log\n");
if (mount("tmpfs", "/var/log", "tmpfs", MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_STRICTATIME | MS_REC, "mode=755,gid=0") < 0)
errExit("mounting /var/log");
fs_logger("tmpfs /var/log");
build_dirs();
release_all();
// create an empty /var/log/wtmp file
/* coverity[toctou] */
FILE *fp = fopen("/var/log/wtmp", "w");
if (fp) {
SET_PERMS_STREAM(fp, 0, wtmp_group, S_IRUSR | S_IWRITE | S_IRGRP | S_IWGRP | S_IROTH);
fclose(fp);
}
fs_logger("touch /var/log/wtmp");
// create an empty /var/log/btmp file
fp = fopen("/var/log/btmp", "w");
if (fp) {
SET_PERMS_STREAM(fp, 0, wtmp_group, S_IRUSR | S_IWRITE | S_IRGRP | S_IWGRP);
fclose(fp);
}
fs_logger("touch /var/log/btmp");
}
else
fwarning("cannot hide /var/log directory\n");
}
void fs_var_lib(void) {
struct stat s;
// ISC DHCP multiserver
if (stat("/var/lib/dhcp", &s) == 0) {
if (arg_debug)
printf("Mounting tmpfs on /var/lib/dhcp\n");
if (mount("tmpfs", "/var/lib/dhcp", "tmpfs", MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_STRICTATIME | MS_REC, "mode=755,gid=0") < 0)
errExit("mounting /var/lib/dhcp");
fs_logger("tmpfs /var/lib/dhcp");
// isc dhcp server requires a /var/lib/dhcp/dhcpd.leases file
FILE *fp = fopen("/var/lib/dhcp/dhcpd.leases", "w");
if (fp) {
fprintf(fp, "\n");
SET_PERMS_STREAM(fp, 0, 0, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
fclose(fp);
fs_logger("touch /var/lib/dhcp/dhcpd.leases");
}
}
// nginx multiserver
if (stat("/var/lib/nginx", &s) == 0) {
if (arg_debug)
printf("Mounting tmpfs on /var/lib/nginx\n");
if (mount("tmpfs", "/var/lib/nginx", "tmpfs", MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_STRICTATIME | MS_REC, "mode=755,gid=0") < 0)
errExit("mounting /var/lib/nginx");
fs_logger("tmpfs /var/lib/nginx");
}
// net-snmp multiserver
if (stat("/var/lib/snmp", &s) == 0) {
if (arg_debug)
printf("Mounting tmpfs on /var/lib/snmp\n");
if (mount("tmpfs", "/var/lib/snmp", "tmpfs", MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_STRICTATIME | MS_REC, "mode=755,gid=0") < 0)
errExit("mounting /var/lib/snmp");
fs_logger("tmpfs /var/lib/snmp");
}
// this is where sudo remembers its state
if (stat("/var/lib/sudo", &s) == 0) {
if (arg_debug)
printf("Mounting tmpfs on /var/lib/sudo\n");
if (mount("tmpfs", "/var/lib/sudo", "tmpfs", MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_STRICTATIME | MS_REC, "mode=755,gid=0") < 0)
errExit("mounting /var/lib/sudo");
fs_logger("tmpfs /var/lib/sudo");
}
}
void save_cpu(void) {
if (cfg.cpus == 0)
return;
FILE *fp = fopen(RUN_CPU_CFG, "w");
if (fp) {
fprintf(fp, "%x\n", cfg.cpus);
SET_PERMS_STREAM(fp, 0, 0, 0600);
fclose(fp);
}
else {
fprintf(stderr, "Error: cannot save cpu affinity mask\n");
exit(1);
}
}
void fs_trace_preload(void) {
struct stat s;
// create an empty /etc/ld.so.preload
if (stat("/etc/ld.so.preload", &s)) {
if (arg_debug)
printf("Creating an empty /etc/ld.so.preload file\n");
/* coverity[toctou] */
FILE *fp = fopen("/etc/ld.so.preload", "w");
if (!fp)
errExit("fopen");
SET_PERMS_STREAM(fp, 0, 0, S_IRUSR | S_IWRITE | S_IRGRP | S_IROTH);
fclose(fp);
fs_logger("touch /etc/ld.so.preload");
}
}
void fs_var_utmp(void) {
struct stat s;
// extract utmp group id
gid_t utmp_group = 0;
if (stat(UTMP_FILE, &s) == 0)
utmp_group = s.st_gid;
else {
fwarning("cannot find /var/run/utmp\n");
return;
}
// create a new utmp file
if (arg_debug)
printf("Create the new utmp file\n");
/* coverity[toctou] */
FILE *fp = fopen(RUN_UTMP_FILE, "w");
if (!fp)
errExit("fopen");
// read current utmp
struct utmp *u;
struct utmp u_boot;
setutent();
while ((u = getutent()) != NULL) {
if (u->ut_type == BOOT_TIME) {
memcpy(&u_boot, u, sizeof(u_boot));
u_boot.ut_tv.tv_sec = (unsigned) time(NULL);
}
}
endutent();
// save new utmp file
int rv = fwrite(&u_boot, sizeof(u_boot), 1, fp);
(void) rv;
SET_PERMS_STREAM(fp, 0, utmp_group, S_IRUSR | S_IWRITE | S_IRGRP | S_IWGRP | S_IROTH);
fclose(fp);
// mount the new utmp file
if (arg_debug)
printf("Mount the new utmp file\n");
if (mount(RUN_UTMP_FILE, UTMP_FILE, NULL, MS_BIND|MS_NOSUID|MS_NOEXEC | MS_NODEV | MS_REC, NULL) < 0)
errExit("mount bind utmp");
fs_logger("create /var/run/utmp");
}
static void deventry_mount(void) {
int i = 0;
while (dev[i].dev_fname != NULL) {
struct stat s;
if (stat(dev[i].run_fname, &s) == 0) {
// check device type and subsystem configuration
if ((dev[i].type == DEV_SOUND && arg_nosound == 0) ||
(dev[i].type == DEV_3D && arg_no3d == 0) ||
(dev[i].type == DEV_VIDEO && arg_novideo == 0) ||
(dev[i].type == DEV_TV && arg_notv == 0) ||
(dev[i].type == DEV_DVD && arg_nodvd == 0) ||
(dev[i].type == DEV_U2F && arg_nou2f == 0)) {
int dir = is_dir(dev[i].run_fname);
if (arg_debug)
printf("mounting %s %s\n", dev[i].run_fname, (dir)? "directory": "file");
if (dir) {
mkdir_attr(dev[i].dev_fname, 0755, 0, 0);
}
else {
struct stat s;
if (stat(dev[i].run_fname, &s) == -1) {
if (arg_debug)
fwarning("cannot stat %s file\n", dev[i].run_fname);
i++;
continue;
}
FILE *fp = fopen(dev[i].dev_fname, "w");
if (fp) {
fprintf(fp, "\n");
SET_PERMS_STREAM(fp, s.st_uid, s.st_gid, s.st_mode);
fclose(fp);
}
}
if (mount(dev[i].run_fname, dev[i].dev_fname, NULL, MS_BIND|MS_REC, NULL) < 0)
errExit("mounting dev file");
fs_logger2("whitelist", dev[i].dev_fname);
}
}
i++;
}
}
void create_empty_file_as_root(const char *fname, mode_t mode) {
assert(fname);
mode &= 07777;
struct stat s;
if (stat(fname, &s)) {
if (arg_debug)
printf("Creating empty %s file\n", fname);
/* coverity[toctou] */
FILE *fp = fopen(fname, "w");
if (!fp)
errExit("fopen");
SET_PERMS_STREAM(fp, 0, 0, S_IRUSR);
fclose(fp);
if (chmod(fname, mode) == -1)
errExit("chmod");
}
}
void save_cgroup(void) {
if (cfg.cgroup == NULL)
return;
FILE *fp = fopen(RUN_CGROUP_CFG, "w");
if (fp) {
fprintf(fp, "%s", cfg.cgroup);
fflush(0);
SET_PERMS_STREAM(fp, 0, 0, 0644);
if (fclose(fp))
goto errout;
}
else
goto errout;
return;
errout:
fprintf(stderr, "Error: cannot save cgroup\n");
exit(1);
}
// return -1 if error, 0 if no error
void touch_file_as_user(const char *fname, uid_t uid, gid_t gid, mode_t mode) {
pid_t child = fork();
if (child < 0)
errExit("fork");
if (child == 0) {
// drop privileges
drop_privs(0);
FILE *fp = fopen(fname, "w");
if (fp) {
fprintf(fp, "\n");
SET_PERMS_STREAM(fp, uid, gid, mode);
fclose(fp);
}
#ifdef HAVE_GCOV
__gcov_flush();
#endif
_exit(0);
}
// wait for the child to finish
waitpid(child, NULL, 0);
}
static void deventry_mount(void) {
int i = 0;
while (dev[i].dev_fname != NULL) {
struct stat s;
if (stat(dev[i].run_fname, &s) == 0) {
int dir = is_dir(dev[i].run_fname);
if (arg_debug)
printf("mounting %s %s\n", dev[i].run_fname, (dir)? "directory": "file");
if (dir) {
if (mkdir(dev[i].dev_fname, 0755) == -1)
errExit("mkdir");
if (chmod(dev[i].dev_fname, 0755) == -1)
errExit("chmod");
ASSERT_PERMS(dev[i].dev_fname, 0, 0, 0755);
}
else {
struct stat s;
if (stat(dev[i].run_fname, &s) == -1) {
if (arg_debug)
printf("Warning: cannot stat %s file\n", dev[i].run_fname);
i++;
continue;
}
FILE *fp = fopen(dev[i].dev_fname, "w");
if (fp) {
fprintf(fp, "\n");
SET_PERMS_STREAM(fp, s.st_uid, s.st_gid, s.st_mode);
fclose(fp);
}
}
if (mount(dev[i].run_fname, dev[i].dev_fname, NULL, MS_BIND|MS_REC, NULL) < 0)
errExit("mounting dev file");
fs_logger2("whitelist", dev[i].dev_fname);
}
i++;
}
}
void fs_resolvconf(void) {
if (cfg.dns1 == 0)
return;
struct stat s;
// create a new /etc/hostname
if (stat("/etc/resolv.conf", &s) == 0) {
if (arg_debug)
printf("Creating a new /etc/resolv.conf file\n");
FILE *fp = fopen(RUN_RESOLVCONF_FILE, "w");
if (!fp) {
fprintf(stderr, "Error: cannot create %s\n", RUN_RESOLVCONF_FILE);
exit(1);
}
if (cfg.dns1)
fprintf(fp, "nameserver %d.%d.%d.%d\n", PRINT_IP(cfg.dns1));
if (cfg.dns2)
fprintf(fp, "nameserver %d.%d.%d.%d\n", PRINT_IP(cfg.dns2));
if (cfg.dns3)
fprintf(fp, "nameserver %d.%d.%d.%d\n", PRINT_IP(cfg.dns3));
// mode and owner
SET_PERMS_STREAM(fp, 0, 0, S_IRUSR | S_IWRITE | S_IRGRP | S_IROTH);
fclose(fp);
// bind-mount the file on top of /etc/hostname
if (mount(RUN_RESOLVCONF_FILE, "/etc/resolv.conf", NULL, MS_BIND|MS_REC, NULL) < 0)
errExit("mount bind /etc/resolv.conf");
fs_logger("create /etc/resolv.conf");
}
else {
fprintf(stderr, "Error: cannot set DNS servers, /etc/resolv.conf file is missing\n");
exit(1);
}
}
void fs_hostname(const char *hostname) {
struct stat s;
// create a new /etc/hostname
if (stat("/etc/hostname", &s) == 0) {
if (arg_debug)
printf("Creating a new /etc/hostname file\n");
create_empty_file_as_root(RUN_HOSTNAME_FILE, S_IRUSR | S_IWRITE | S_IRGRP | S_IROTH);
// bind-mount the file on top of /etc/hostname
if (mount(RUN_HOSTNAME_FILE, "/etc/hostname", NULL, MS_BIND|MS_REC, NULL) < 0)
errExit("mount bind /etc/hostname");
fs_logger("create /etc/hostname");
}
// create a new /etc/hosts
if (stat("/etc/hosts", &s) == 0) {
if (arg_debug)
printf("Creating a new /etc/hosts file\n");
// copy /etc/host into our new file, and modify it on the fly
/* coverity[toctou] */
FILE *fp1 = fopen("/etc/hosts", "r");
if (!fp1)
goto errexit;
FILE *fp2 = fopen(RUN_HOSTS_FILE, "w");
if (!fp2) {
fclose(fp1);
goto errexit;
}
char buf[4096];
int done = 0;
while (fgets(buf, sizeof(buf), fp1)) {
// remove '\n'
char *ptr = strchr(buf, '\n');
if (ptr)
*ptr = '\0';
// copy line
if (strstr(buf, "127.0.0.1") && done == 0) {
done = 1;
fprintf(fp2, "%s %s\n", buf, hostname);
}
else
fprintf(fp2, "%s\n", buf);
}
fclose(fp1);
// mode and owner
SET_PERMS_STREAM(fp2, 0, 0, S_IRUSR | S_IWRITE | S_IRGRP | S_IROTH);
fclose(fp2);
// bind-mount the file on top of /etc/hostname
if (mount(RUN_HOSTS_FILE, "/etc/hosts", NULL, MS_BIND|MS_REC, NULL) < 0)
errExit("mount bind /etc/hosts");
fs_logger("create /etc/hosts");
}
return;
errexit:
fprintf(stderr, "Error: cannot create hostname file\n");
exit(1);
}
static void sanitize_group(void) {
struct stat s;
if (stat("/etc/group", &s) == -1)
return;
assert(gid_min);
if (arg_debug)
printf("Sanitizing /etc/group, GID_MIN %d\n", gid_min);
if (is_link("/etc/group")) {
fprintf(stderr, "Error: invalid /etc/group\n");
exit(1);
}
FILE *fpin = NULL;
FILE *fpout = NULL;
// open files
/* coverity[toctou] */
fpin = fopen("/etc/group", "r");
if (!fpin)
goto errout;
fpout = fopen(RUN_GROUP_FILE, "w");
if (!fpout)
goto errout;
// read the file line by line
char buf[MAXBUF];
gid_t mygid = getgid();
while (fgets(buf, MAXBUF, fpin)) {
// comments and empty lines
if (*buf == '\0' || *buf == '#')
continue;
// sample line:
// pulse:x:115:netblue,bingo
// drop lines with uid > 1000 and not the current user group
char *ptr = buf;
// advance to uid
while (*ptr != ':' && *ptr != '\0')
ptr++;
if (*ptr == '\0')
goto errout;
ptr++;
while (*ptr != ':' && *ptr != '\0')
ptr++;
if (*ptr == '\0')
goto errout;
ptr++;
if (*ptr == '\0')
goto errout;
// process uid
int gid;
int rv = sscanf(ptr, "%d:", &gid);
if (rv == 0 || gid < 0)
goto errout;
assert(gid_min);
if (gid < gid_min || gid == 65534) { // on Debian platforms 65534 is group nogroup
if (copy_line(fpout, buf, ptr))
goto errout;
continue;
}
if ((gid_t) gid != mygid) {
continue; // skip line
}
if (copy_line(fpout, buf, ptr))
goto errout;
}
fclose(fpin);
SET_PERMS_STREAM(fpout, 0, 0, 0644);
fclose(fpout);
// mount-bind tne new group file
if (mount(RUN_GROUP_FILE, "/etc/group", "none", MS_BIND, "mode=400,gid=0") < 0)
errExit("mount");
fs_logger("create /etc/group");
return;
errout:
fwarning("failed to clean up /etc/group\n");
if (fpin)
fclose(fpin);
if (fpout)
fclose(fpout);
}
static void sanitize_passwd(void) {
struct stat s;
if (stat("/etc/passwd", &s) == -1)
return;
assert(uid_min);
if (arg_debug)
printf("Sanitizing /etc/passwd, UID_MIN %d\n", uid_min);
if (is_link("/etc/passwd")) {
fprintf(stderr, "Error: invalid /etc/passwd\n");
exit(1);
}
FILE *fpin = NULL;
FILE *fpout = NULL;
// open files
/* coverity[toctou] */
fpin = fopen("/etc/passwd", "r");
if (!fpin)
goto errout;
fpout = fopen(RUN_PASSWD_FILE, "w");
if (!fpout)
goto errout;
// read the file line by line
char buf[MAXBUF];
uid_t myuid = getuid();
while (fgets(buf, MAXBUF, fpin)) {
// comments and empty lines
if (*buf == '\0' || *buf == '#')
continue;
// sample line:
// www-data:x:33:33:www-data:/var/www:/bin/sh
// drop lines with uid > 1000 and not the current user
char *ptr = buf;
// advance to uid
while (*ptr != ':' && *ptr != '\0')
ptr++;
if (*ptr == '\0')
goto errout;
char *ptr1 = ptr;
ptr++;
while (*ptr != ':' && *ptr != '\0')
ptr++;
if (*ptr == '\0')
goto errout;
ptr++;
if (*ptr == '\0')
goto errout;
// process uid
int uid;
int rv = sscanf(ptr, "%d:", &uid);
if (rv == 0 || uid < 0)
goto errout;
assert(uid_min);
if (uid < uid_min || uid == 65534) { // on Debian platforms user nobody is 65534
fprintf(fpout, "%s", buf);
continue;
}
if ((uid_t) uid != myuid) {
// store user name - necessary to process /etc/group
*ptr1 = '\0';
char *user = strdup(buf);
if (!user)
errExit("malloc");
ulist_add(user);
continue; // skip line
}
fprintf(fpout, "%s", buf);
}
fclose(fpin);
SET_PERMS_STREAM(fpout, 0, 0, 0644);
fclose(fpout);
// mount-bind tne new password file
if (mount(RUN_PASSWD_FILE, "/etc/passwd", "none", MS_BIND, "mode=400,gid=0") < 0)
errExit("mount");
fs_logger("create /etc/passwd");
return;
errout:
fwarning("failed to clean up /etc/passwd\n");
if (fpin)
fclose(fpin);
if (fpout)
fclose(fpout);
}
// disable shm in pulseaudio
void pulseaudio_init(void) {
struct stat s;
// do we have pulseaudio in the system?
if (stat("/etc/pulse/client.conf", &s) == -1) {
if (arg_debug)
printf("/etc/pulse/client.conf not found\n");
return;
}
// create the new user pulseaudio directory
if (mkdir(RUN_PULSE_DIR, 0700) == -1)
errExit("mkdir");
// make it a mount point and add mount flags
if (mount(RUN_PULSE_DIR, RUN_PULSE_DIR, NULL, MS_BIND, NULL) < 0 ||
mount(NULL, RUN_PULSE_DIR, NULL, MS_NOEXEC|MS_NODEV|MS_NOSUID|MS_BIND|MS_REMOUNT, NULL) < 0)
errExit("mount RUN_PULSE_DIR");
// create the new client.conf file
char *pulsecfg = NULL;
if (asprintf(&pulsecfg, "%s/client.conf", RUN_PULSE_DIR) == -1)
errExit("asprintf");
if (copy_file("/etc/pulse/client.conf", pulsecfg, -1, -1, 0644)) // root needed
errExit("copy_file");
FILE *fp = fopen(pulsecfg, "a+");
if (!fp)
errExit("fopen");
fprintf(fp, "%s", "\nenable-shm = no\n");
SET_PERMS_STREAM(fp, getuid(), getgid(), 0644);
fclose(fp);
// hand over the directory to the user
if (set_perms(RUN_PULSE_DIR, getuid(), getgid(), 0700))
errExit("set_perms");
// create ~/.config/pulse directory if not present
char *dir1;
if (asprintf(&dir1, "%s/.config", cfg.homedir) == -1)
errExit("asprintf");
if (lstat(dir1, &s) == -1) {
pid_t child = fork();
if (child < 0)
errExit("fork");
if (child == 0) {
// drop privileges
drop_privs(0);
int rv = mkdir(dir1, 0755);
if (rv == 0) {
if (set_perms(dir1, getuid(), getgid(), 0755))
{;} // do nothing
}
#ifdef HAVE_GCOV
__gcov_flush();
#endif
_exit(0);
}
// wait for the child to finish
waitpid(child, NULL, 0);
fs_logger2("create", dir1);
}
else {
// we expect a user owned directory
if (!S_ISDIR(s.st_mode) || s.st_uid != getuid()) {
if (S_ISLNK(s.st_mode))
fprintf(stderr, "Error: user .config is a symbolic link\n");
else
fprintf(stderr, "Error: user .config is not a directory owned by the current user\n");
exit(1);
}
}
free(dir1);
if (asprintf(&dir1, "%s/.config/pulse", cfg.homedir) == -1)
errExit("asprintf");
if (lstat(dir1, &s) == -1) {
pid_t child = fork();
if (child < 0)
errExit("fork");
if (child == 0) {
// drop privileges
drop_privs(0);
int rv = mkdir(dir1, 0700);
if (rv == 0) {
if (set_perms(dir1, getuid(), getgid(), 0700))
{;} // do nothing
}
#ifdef HAVE_GCOV
__gcov_flush();
#endif
_exit(0);
}
// wait for the child to finish
waitpid(child, NULL, 0);
fs_logger2("create", dir1);
}
else {
// we expect a user owned directory
if (!S_ISDIR(s.st_mode) || s.st_uid != getuid()) {
if (S_ISLNK(s.st_mode))
fprintf(stderr, "Error: user .config/pulse is a symbolic link\n");
else
fprintf(stderr, "Error: user .config/pulse is not a directory owned by the current user\n");
exit(1);
}
}
free(dir1);
// if we have ~/.config/pulse mount the new directory, else set environment variable.
char *homeusercfg;
if (asprintf(&homeusercfg, "%s/.config/pulse", cfg.homedir) == -1)
errExit("asprintf");
if (stat(homeusercfg, &s) == 0) {
// get a file descriptor for ~/.config/pulse, fails if there is any symlink
int fd = safe_fd(homeusercfg, O_PATH|O_DIRECTORY|O_NOFOLLOW|O_CLOEXEC);
if (fd == -1)
errExit("safe_fd");
// confirm the actual mount destination is owned by the user
if (fstat(fd, &s) == -1 || s.st_uid != getuid())
errExit("fstat");
// mount via the link in /proc/self/fd
char *proc;
if (asprintf(&proc, "/proc/self/fd/%d", fd) == -1)
errExit("asprintf");
if (mount(RUN_PULSE_DIR, proc, "none", MS_BIND, NULL) < 0)
errExit("mount pulseaudio");
fs_logger2("tmpfs", homeusercfg);
free(proc);
close(fd);
// check /proc/self/mountinfo to confirm the mount is ok
MountData *mptr = get_last_mount();
if (strcmp(mptr->dir, homeusercfg) != 0 || strcmp(mptr->fstype, "tmpfs") != 0)
errLogExit("invalid pulseaudio mount");
char *p;
if (asprintf(&p, "%s/client.conf", homeusercfg) == -1)
errExit("asprintf");
fs_logger2("create", p);
free(p);
}
else {
// set environment
if (setenv("PULSE_CLIENTCONFIG", pulsecfg, 1) < 0)
errExit("setenv");
}
free(pulsecfg);
free(homeusercfg);
}
static void skel(const char *homedir, uid_t u, gid_t g) {
char *fname;
// zsh
if (!arg_shell_none && (strcmp(cfg.shell,"/usr/bin/zsh") == 0 || strcmp(cfg.shell,"/bin/zsh") == 0)) {
// copy skel files
if (asprintf(&fname, "%s/.zshrc", homedir) == -1)
errExit("asprintf");
struct stat s;
// don't copy it if we already have the file
if (stat(fname, &s) == 0)
return;
if (stat("/etc/skel/.zshrc", &s) == 0) {
if (copy_file("/etc/skel/.zshrc", fname, u, g, 0644) == 0) {
fs_logger("clone /etc/skel/.zshrc");
}
}
else { //
FILE *fp = fopen(fname, "w");
if (fp) {
fprintf(fp, "\n");
SET_PERMS_STREAM(fp, u, g, S_IRUSR | S_IWUSR);
fclose(fp);
fs_logger2("touch", fname);
}
}
free(fname);
}
// csh
else if (!arg_shell_none && strcmp(cfg.shell,"/bin/csh") == 0) {
// copy skel files
if (asprintf(&fname, "%s/.cshrc", homedir) == -1)
errExit("asprintf");
struct stat s;
// don't copy it if we already have the file
if (stat(fname, &s) == 0)
return;
if (stat("/etc/skel/.cshrc", &s) == 0) {
if (copy_file("/etc/skel/.cshrc", fname, u, g, 0644) == 0) {
fs_logger("clone /etc/skel/.cshrc");
}
}
else { //
/* coverity[toctou] */
FILE *fp = fopen(fname, "w");
if (fp) {
fprintf(fp, "\n");
SET_PERMS_STREAM(fp, u, g, S_IRUSR | S_IWUSR);
fclose(fp);
fs_logger2("touch", fname);
}
}
free(fname);
}
// bash etc.
else {
// copy skel files
if (asprintf(&fname, "%s/.bashrc", homedir) == -1)
errExit("asprintf");
struct stat s;
// don't copy it if we already have the file
if (stat(fname, &s) == 0)
return;
if (stat("/etc/skel/.bashrc", &s) == 0) {
if (copy_file("/etc/skel/.bashrc", fname, u, g, 0644) == 0) {
fs_logger("clone /etc/skel/.bashrc");
}
}
free(fname);
}
}
// disable shm in pulseaudio
void pulseaudio_init(void) {
struct stat s;
// do we have pulseaudio in the system?
if (stat("/etc/pulse/client.conf", &s) == -1) {
if (arg_debug)
printf("/etc/pulse/client.conf not found\n");
return;
}
// create the new user pulseaudio directory
if (mkdir(RUN_PULSE_DIR, 0700) == -1)
errExit("mkdir");
// mount it nosuid, noexec, nodev
fs_noexec(RUN_PULSE_DIR);
// create the new client.conf file
char *pulsecfg = NULL;
if (asprintf(&pulsecfg, "%s/client.conf", RUN_PULSE_DIR) == -1)
errExit("asprintf");
if (copy_file("/etc/pulse/client.conf", pulsecfg, -1, -1, 0644)) // root needed
errExit("copy_file");
FILE *fp = fopen(pulsecfg, "a");
if (!fp)
errExit("fopen");
fprintf(fp, "%s", "\nenable-shm = no\n");
SET_PERMS_STREAM(fp, getuid(), getgid(), 0644);
fclose(fp);
// hand over the directory to the user
if (set_perms(RUN_PULSE_DIR, getuid(), getgid(), 0700))
errExit("set_perms");
// create ~/.config/pulse directory if not present
char *homeusercfg;
if (asprintf(&homeusercfg, "%s/.config", cfg.homedir) == -1)
errExit("asprintf");
if (lstat(homeusercfg, &s) == -1) {
if (create_empty_dir_as_user(homeusercfg, 0700))
fs_logger2("create", homeusercfg);
}
else if (!S_ISDIR(s.st_mode)) {
if (S_ISLNK(s.st_mode))
fprintf(stderr, "Error: %s is a symbolic link\n", homeusercfg);
else
fprintf(stderr, "Error: %s is not a directory\n", homeusercfg);
exit(1);
}
free(homeusercfg);
if (asprintf(&homeusercfg, "%s/.config/pulse", cfg.homedir) == -1)
errExit("asprintf");
if (lstat(homeusercfg, &s) == -1) {
if (create_empty_dir_as_user(homeusercfg, 0700))
fs_logger2("create", homeusercfg);
}
else if (!S_ISDIR(s.st_mode)) {
if (S_ISLNK(s.st_mode))
fprintf(stderr, "Error: %s is a symbolic link\n", homeusercfg);
else
fprintf(stderr, "Error: %s is not a directory\n", homeusercfg);
exit(1);
}
// if we have ~/.config/pulse mount the new directory, else set environment variable.
if (stat(homeusercfg, &s) == 0) {
// get a file descriptor for ~/.config/pulse, fails if there is any symlink
int fd = safe_fd(homeusercfg, O_PATH|O_DIRECTORY|O_NOFOLLOW|O_CLOEXEC);
if (fd == -1)
errExit("safe_fd");
// confirm the actual mount destination is owned by the user
if (fstat(fd, &s) == -1)
errExit("fstat");
if (s.st_uid != getuid()) {
fprintf(stderr, "Error: %s is not owned by the current user\n", homeusercfg);
exit(1);
}
// preserve a read-only mount
struct statvfs vfs;
if (fstatvfs(fd, &vfs) == -1)
errExit("fstatvfs");
if ((vfs.f_flag & MS_RDONLY) == MS_RDONLY)
fs_rdonly(RUN_PULSE_DIR);
// mount via the link in /proc/self/fd
char *proc;
if (asprintf(&proc, "/proc/self/fd/%d", fd) == -1)
errExit("asprintf");
if (mount(RUN_PULSE_DIR, proc, "none", MS_BIND, NULL) < 0)
errExit("mount pulseaudio");
fs_logger2("tmpfs", homeusercfg);
free(proc);
close(fd);
// check /proc/self/mountinfo to confirm the mount is ok
MountData *mptr = get_last_mount();
if (strcmp(mptr->dir, homeusercfg) != 0 || strcmp(mptr->fstype, "tmpfs") != 0)
errLogExit("invalid pulseaudio mount");
char *p;
if (asprintf(&p, "%s/client.conf", homeusercfg) == -1)
errExit("asprintf");
fs_logger2("create", p);
free(p);
}
else {
// set environment
if (setenv("PULSE_CLIENTCONFIG", pulsecfg, 1) < 0)
errExit("setenv");
}
free(pulsecfg);
free(homeusercfg);
}
static void whitelist_path(ProfileEntry *entry) {
assert(entry);
char *path = entry->data + 10;
assert(path);
const char *fname;
char *wfile = NULL;
if (entry->home_dir) {
if (strncmp(path, cfg.homedir, strlen(cfg.homedir)) == 0) {
fname = path + strlen(cfg.homedir);
if (*fname == '\0')
goto errexit;
}
else
fname = path;
if (asprintf(&wfile, "%s/%s", RUN_WHITELIST_HOME_USER_DIR, fname) == -1)
errExit("asprintf");
}
else if (entry->tmp_dir) {
fname = path + 4; // strlen("/tmp")
if (*fname == '\0')
goto errexit;
if (asprintf(&wfile, "%s/%s", RUN_WHITELIST_TMP_DIR, fname) == -1)
errExit("asprintf");
}
else if (entry->media_dir) {
fname = path + 6; // strlen("/media")
if (*fname == '\0')
goto errexit;
if (asprintf(&wfile, "%s/%s", RUN_WHITELIST_MEDIA_DIR, fname) == -1)
errExit("asprintf");
}
else if (entry->mnt_dir) {
fname = path + 4; // strlen("/mnt")
if (*fname == '\0')
goto errexit;
if (asprintf(&wfile, "%s/%s", RUN_WHITELIST_MNT_DIR, fname) == -1)
errExit("asprintf");
}
else if (entry->var_dir) {
fname = path + 4; // strlen("/var")
if (*fname == '\0')
goto errexit;
if (asprintf(&wfile, "%s/%s", RUN_WHITELIST_VAR_DIR, fname) == -1)
errExit("asprintf");
}
else if (entry->dev_dir) {
fname = path + 4; // strlen("/dev")
if (*fname == '\0')
goto errexit;
if (asprintf(&wfile, "%s/%s", RUN_WHITELIST_DEV_DIR, fname) == -1)
errExit("asprintf");
}
else if (entry->opt_dir) {
fname = path + 4; // strlen("/opt")
if (*fname == '\0')
goto errexit;
if (asprintf(&wfile, "%s/%s", RUN_WHITELIST_OPT_DIR, fname) == -1)
errExit("asprintf");
}
else if (entry->srv_dir) {
fname = path + 4; // strlen("/srv")
if (*fname == '\0')
goto errexit;
if (asprintf(&wfile, "%s/%s", RUN_WHITELIST_SRV_DIR, fname) == -1)
errExit("asprintf");
}
// check if the file exists
struct stat s;
if (wfile && stat(wfile, &s) == 0) {
if (arg_debug || arg_debug_whitelists)
printf("Whitelisting %s\n", path);
}
else {
return;
}
// create the path if necessary
mkpath(path, s.st_mode);
fs_logger2("whitelist", path);
// process directory
if (S_ISDIR(s.st_mode)) {
// create directory
int rv = mkdir(path, 0755);
(void) rv;
}
// process regular file
else {
if (access(path, R_OK)) {
// create an empty file
FILE *fp = fopen(path, "w");
if (!fp) {
fprintf(stderr, "Error: cannot create empty file in home directory\n");
exit(1);
}
// set file properties
SET_PERMS_STREAM(fp, s.st_uid, s.st_gid, s.st_mode);
fclose(fp);
}
else
return; // the file is already present
}
// mount
if (mount(wfile, path, NULL, MS_BIND|MS_REC, NULL) < 0)
errExit("mount bind");
free(wfile);
return;
errexit:
fprintf(stderr, "Error: file %s is not in the whitelisted directory\n", path);
exit(1);
}