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/*
* Copyright (C) 2014-2016 Firejail Authors
*
* This file is part of firejail project
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "firejail.h"
#include <dirent.h>
#include <sys/stat.h>
#define MAX_READ 8192 // line buffer for profile files
// find and read the profile specified by name from dir directory
int profile_find(const char *name, const char *dir) {
assert(name);
assert(dir);
int rv = 0;
DIR *dp;
char *pname;
if (asprintf(&pname, "%s.profile", name) == -1)
errExit("asprintf");
dp = opendir (dir);
if (dp != NULL) {
struct dirent *ep;
while ((ep = readdir(dp)) != NULL) {
if (strcmp(ep->d_name, pname) == 0) {
if (arg_debug)
printf("Found %s profile in %s directory\n", name, dir);
char *etcpname;
if (asprintf(&etcpname, "%s/%s", dir, pname) == -1)
errExit("asprintf");
profile_read(etcpname);
free(etcpname);
rv = 1;
break;
}
}
(void) closedir (dp);
}
free(pname);
return rv;
}
//***************************************************
// run-time profiles
//***************************************************
// check profile line; if line == 0, this was generated from a command line option
// return 1 if the command is to be added to the linked list of profile commands
// return 0 if the command was already executed inside the function
int profile_check_line(char *ptr, int lineno, const char *fname) {
// check ignore list
int i;
for (i = 0; i < MAX_PROFILE_IGNORE; i++) {
if (cfg.profile_ignore[i] == NULL)
break;
if (strncmp(ptr, cfg.profile_ignore[i], strlen(cfg.profile_ignore[i])) == 0)
return 0; // ignore line
}
if (strncmp(ptr, "ignore ", 7) == 0) {
char *str = strdup(ptr + 7);
if (*str == '\0') {
fprintf(stderr, "Error: invalid ignore option\n");
exit(1);
}
// find an empty entry in profile_ignore array
int j;
for (j = 0; j < MAX_PROFILE_IGNORE; j++) {
if (cfg.profile_ignore[j] == NULL)
break;
}
if (j >= MAX_PROFILE_IGNORE) {
fprintf(stderr, "Error: maximum %d --ignore options are permitted\n", MAX_PROFILE_IGNORE);
exit(1);
}
// ... and configure it
else
cfg.profile_ignore[j] = str;
return 0;
}
// sandbox name
if (strncmp(ptr, "name ", 5) == 0) {
cfg.name = ptr + 5;
if (strlen(cfg.name) == 0) {
fprintf(stderr, "Error: invalid sandbox name\n");
exit(1);
}
return 0;
}
// seccomp, caps, private, user namespace
else if (strcmp(ptr, "noroot") == 0) {
#if HAVE_USERNS
check_user_namespace();
#endif
return 0;
}
else if (strcmp(ptr, "seccomp") == 0) {
arg_seccomp = 1;
return 0;
}
else if (strcmp(ptr, "caps") == 0) {
arg_caps_default_filter = 1;
return 0;
}
else if (strcmp(ptr, "caps.drop all") == 0) {
arg_caps_drop_all = 1;
return 0;
}
else if (strcmp(ptr, "shell none") == 0) {
arg_shell_none = 1;
return 0;
}
else if (strcmp(ptr, "tracelog") == 0) {
arg_tracelog = 1;
return 0;
}
else if (strcmp(ptr, "private") == 0) {
arg_private = 1;
return 0;
}
else if (strcmp(ptr, "private-dev") == 0) {
arg_private_dev = 1;
return 0;
}
else if (strcmp(ptr, "private-tmp") == 0) {
arg_private_tmp = 1;
return 0;
}
else if (strcmp(ptr, "nogroups") == 0) {
arg_nogroups = 1;
return 0;
}
else if (strcmp(ptr, "netfilter") == 0) {
#ifdef HAVE_NETWORK
arg_netfilter = 1;
#endif
return 0;
}
else if (strncmp(ptr, "netfilter ", 10) == 0) {
#ifdef HAVE_NETWORK
arg_netfilter = 1;
arg_netfilter_file = strdup(ptr + 10);
if (!arg_netfilter_file)
errExit("strdup");
check_netfilter_file(arg_netfilter_file);
#endif
return 0;
}
else if (strncmp(ptr, "netfilter6 ", 11) == 0) {
#ifdef HAVE_NETWORK
arg_netfilter6 = 1;
arg_netfilter6_file = strdup(ptr + 11);
if (!arg_netfilter6_file)
errExit("strdup");
check_netfilter_file(arg_netfilter6_file);
#endif
return 0;
}
else if (strcmp(ptr, "net none") == 0) {
#ifdef HAVE_NETWORK
arg_nonetwork = 1;
cfg.bridge0.configured = 0;
cfg.bridge1.configured = 0;
cfg.bridge2.configured = 0;
cfg.bridge3.configured = 0;
#endif
return 0;
}
#ifdef HAVE_SECCOMP
if (strncmp(ptr, "protocol ", 9) == 0) {
protocol_store(ptr + 9);
return 0;
}
#endif
if (strncmp(ptr, "env ", 4) == 0) {
env_store(ptr + 4);
return 0;
}
// seccomp drop list on top of default list
if (strncmp(ptr, "seccomp ", 8) == 0) {
arg_seccomp = 1;
#ifdef HAVE_SECCOMP
cfg.seccomp_list = strdup(ptr + 8);
if (!cfg.seccomp_list)
errExit("strdup");
#endif
return 0;
}
// seccomp drop list without default list
if (strncmp(ptr, "seccomp.drop ", 13) == 0) {
arg_seccomp = 1;
#ifdef HAVE_SECCOMP
cfg.seccomp_list_drop = strdup(ptr + 13);
if (!cfg.seccomp_list_drop)
errExit("strdup");
#endif
return 0;
}
// seccomp keep list
if (strncmp(ptr, "seccomp.keep ", 13) == 0) {
arg_seccomp = 1;
#ifdef HAVE_SECCOMP
cfg.seccomp_list_keep= strdup(ptr + 13);
if (!cfg.seccomp_list_keep)
errExit("strdup");
#endif
return 0;
}
// caps drop list
if (strncmp(ptr, "caps.drop ", 10) == 0) {
arg_caps_drop = 1;
arg_caps_list = strdup(ptr + 10);
if (!arg_caps_list)
errExit("strdup");
// verify seccomp list and exit if problems
if (caps_check_list(arg_caps_list, NULL))
exit(1);
return 0;
}
// caps keep list
if (strncmp(ptr, "caps.keep ", 10) == 0) {
arg_caps_keep = 1;
arg_caps_list = strdup(ptr + 10);
if (!arg_caps_list)
errExit("strdup");
// verify seccomp list and exit if problems
if (caps_check_list(arg_caps_list, NULL))
exit(1);
return 0;
}
// hostname
if (strncmp(ptr, "hostname ", 9) == 0) {
cfg.hostname = ptr + 9;
return 0;
}
// dns
if (strncmp(ptr, "dns ", 4) == 0) {
uint32_t dns;
if (atoip(ptr + 4, &dns)) {
fprintf(stderr, "Error: invalid DNS server IP address\n");
return 1;
}
if (cfg.dns1 == 0)
cfg.dns1 = dns;
else if (cfg.dns2 == 0)
cfg.dns2 = dns;
else if (cfg.dns3 == 0)
cfg.dns3 = dns;
else {
fprintf(stderr, "Error: up to 3 DNS servers can be specified\n");
return 1;
}
return 0;
}
// cpu affinity
if (strncmp(ptr, "cpu ", 4) == 0) {
read_cpu_list(ptr + 4);
return 0;
}
// nice value
if (strncmp(ptr, "nice ", 4) == 0) {
cfg.nice = atoi(ptr + 5);
arg_nice = 1;
return 0;
}
// cgroup
if (strncmp(ptr, "cgroup ", 7) == 0) {
set_cgroup(ptr + 7);
return 0;
}
// private directory
if (strncmp(ptr, "private ", 8) == 0) {
cfg.home_private = ptr + 8;
fs_check_private_dir();
arg_private = 1;
return 0;
}
// private /etc list of files and directories
if (strncmp(ptr, "private-etc ", 12) == 0) {
cfg.etc_private_keep = ptr + 12;
fs_check_etc_list();
if (*cfg.etc_private_keep != '\0')
arg_private_etc = 1;
else {
arg_private_etc = 0;
fprintf(stderr, "Warning: private-etc disabled, no file found\n");
}
return 0;
}
// private /bin list of files
if (strncmp(ptr, "private-bin ", 12) == 0) {
cfg.bin_private_keep = ptr + 12;
fs_check_bin_list();
arg_private_bin = 1;
return 0;
}
// filesystem bind
if (strncmp(ptr, "bind ", 5) == 0) {
if (getuid() != 0) {
fprintf(stderr, "Error: --bind option is available only if running as root\n");
exit(1);
}
// extract two directories
char *dname1 = ptr + 5;
char *dname2 = split_comma(dname1); // this inserts a '0 to separate the two dierctories
if (dname2 == NULL) {
fprintf(stderr, "Error: missing second directory for bind\n");
exit(1);
}
// check directories
invalid_filename(dname1);
invalid_filename(dname2);
if (strstr(dname1, "..") || strstr(dname2, "..")) {
fprintf(stderr, "Error: invalid file name.\n");
exit(1);
}
// insert comma back
*(dname2 - 1) = ',';
return 1;
}
// rlimit
if (strncmp(ptr, "rlimit", 6) == 0) {
if (strncmp(ptr, "rlimit-nofile ", 14) == 0) {
ptr += 14;
if (not_unsigned(ptr)) {
fprintf(stderr, "Invalid rlimit option on line %d\n", lineno);
exit(1);
}
sscanf(ptr, "%u", &cfg.rlimit_nofile);
arg_rlimit_nofile = 1;
}
else if (strncmp(ptr, "rlimit-nproc ", 13) == 0) {
ptr += 13;
if (not_unsigned(ptr)) {
fprintf(stderr, "Invalid rlimit option on line %d\n", lineno);
exit(1);
}
sscanf(ptr, "%u", &cfg.rlimit_nproc);
arg_rlimit_nproc = 1;
}
else if (strncmp(ptr, "rlimit-fsize ", 13) == 0) {
ptr += 13;
if (not_unsigned(ptr)) {
fprintf(stderr, "Invalid rlimit option on line %d\n", lineno);
exit(1);
}
sscanf(ptr, "%u", &cfg.rlimit_fsize);
arg_rlimit_fsize = 1;
}
else if (strncmp(ptr, "rlimit-sigpending ", 18) == 0) {
ptr += 18;
if (not_unsigned(ptr)) {
fprintf(stderr, "Invalid rlimit option on line %d\n", lineno);
exit(1);
}
sscanf(ptr, "%u", &cfg.rlimit_sigpending);
arg_rlimit_sigpending = 1;
}
else {
fprintf(stderr, "Invalid rlimit option on line %d\n", lineno);
exit(1);
}
return 0;
}
// rest of filesystem
if (strncmp(ptr, "blacklist ", 10) == 0)
ptr += 10;
else if (strncmp(ptr, "blacklist-nolog ", 16) == 0)
ptr += 16;
else if (strncmp(ptr, "noblacklist ", 12) == 0)
ptr += 12;
else if (strncmp(ptr, "whitelist ", 10) == 0) {
arg_whitelist = 1;
ptr += 10;
}
else if (strncmp(ptr, "read-only ", 10) == 0)
ptr += 10;
else if (strncmp(ptr, "tmpfs ", 6) == 0) {
if (getuid() != 0) {
fprintf(stderr, "Error: tmpfs available only when running the sandbox as root\n");
exit(1);
}
ptr += 6;
}
else {
if (lineno == 0)
fprintf(stderr, "Error: \"%s\" as a command line option is invalid\n", ptr);
else if (fname != NULL)
fprintf(stderr, "Error: line %d in %s is invalid\n", lineno, fname);
else
fprintf(stderr, "Error: line %d in the custom profile is invalid\n", lineno);
exit(1);
}
// some characters just don't belong in filenames
invalid_filename(ptr);
if (strstr(ptr, "..")) {
if (lineno == 0)
fprintf(stderr, "Error: \"%s\" is an invalid filename\n", ptr);
else if (fname != NULL)
fprintf(stderr, "Error: line %d in %s is invalid\n", lineno, fname);
else
fprintf(stderr, "Error: line %d in the custom profile is invalid\n", lineno);
exit(1);
}
return 1;
}
// add a profile entry in cfg.profile list; use str to populate the list
void profile_add(char *str) {
ProfileEntry *prf = malloc(sizeof(ProfileEntry));
if (!prf)
errExit("malloc");
memset(prf, 0, sizeof(ProfileEntry));
prf->next = NULL;
prf->data = str;
// add prf to the list
if (cfg.profile == NULL) {
cfg.profile = prf;
return;
}
ProfileEntry *ptr = cfg.profile;
while (ptr->next != NULL)
ptr = ptr->next;
ptr->next = prf;
}
// read a profile file
static int include_level = 0;
void profile_read(const char *fname) {
// exit program if maximum include level was reached
if (include_level > MAX_INCLUDE_LEVEL) {
fprintf(stderr, "Error: maximum profile include level was reached\n");
exit(1);
}
if (strlen(fname) == 0) {
fprintf(stderr, "Error: invalid profile file\n");
exit(1);
}
// open profile file:
FILE *fp = fopen(fname, "r");
if (fp == NULL) {
fprintf(stderr, "Error: cannot open profile file %s\n", fname);
exit(1);
}
if (!arg_quiet)
fprintf(stderr, "Reading profile %s\n", fname);
// read the file line by line
char buf[MAX_READ + 1];
int lineno = 0;
while (fgets(buf, MAX_READ, fp)) {
++lineno;
// remove empty space - ptr in allocated memory
char *ptr = line_remove_spaces(buf);
if (ptr == NULL)
continue;
// comments
if (*ptr == '#' || *ptr == '\0') {
free(ptr);
continue;
}
// process include
if (strncmp(ptr, "include ", 8) == 0) {
include_level++;
// extract profile filename and new skip params
char *newprofile = ptr + 8; // profile name
// expand ${HOME}/ in front of the new profile file
char *newprofile2 = expand_home(newprofile, cfg.homedir);
// recursivity
profile_read((newprofile2)? newprofile2:newprofile);
include_level--;
if (newprofile2)
free(newprofile2);
free(ptr);
continue;
}
// verify syntax, exit in case of error
if (profile_check_line(ptr, lineno, fname))
profile_add(ptr);
// we cannot free ptr here, data is extracted from ptr and linked as a pointer in cfg structure
// else {
// free(ptr);
// }
}
fclose(fp);
}
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