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/*
* Copyright (C) 2014-2020 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 <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>
typedef struct env_t {
struct env_t *next;
char *name;
char *value;
ENV_OP op;
} Env;
static Env *envlist = NULL;
static void env_add(Env *env) {
env->next = NULL;
// add the new entry at the end of the list
if (envlist == NULL) {
envlist = env;
return;
}
Env *ptr = envlist;
while (1) {
if (ptr->next == NULL) {
ptr->next = env;
break;
}
ptr = ptr->next;
}
}
// load IBUS env variables
void env_ibus_load(void) {
EUID_ASSERT();
// check ~/.config/ibus/bus directory
char *dirname;
if (asprintf(&dirname, "%s/.config/ibus/bus", cfg.homedir) == -1)
errExit("asprintf");
struct stat s;
if (stat(dirname, &s) == -1)
return;
// find the file
/* coverity[toctou] */
DIR *dir = opendir(dirname);
if (!dir) {
free(dirname);
return;
}
struct dirent *entry;
while ((entry = readdir(dir)) != NULL) {
// check the file name ends in "unix-0"
char *ptr = strstr(entry->d_name, "unix-0");
if (!ptr)
continue;
if (strlen(ptr) != 6)
continue;
// open the file
char *fname;
if (asprintf(&fname, "%s/%s", dirname, entry->d_name) == -1)
errExit("asprintf");
FILE *fp = fopen(fname, "r");
free(fname);
if (!fp)
continue;
// read the file
const int maxline = 4096;
char buf[maxline];
while (fgets(buf, maxline, fp)) {
if (strncmp(buf, "IBUS_", 5) != 0)
continue;
char *ptr = strchr(buf, '=');
if (!ptr)
continue;
ptr = strchr(buf, '\n');
if (ptr)
*ptr = '\0';
if (arg_debug)
printf("%s\n", buf);
env_store(buf, SETENV);
}
fclose(fp);
}
free(dirname);
closedir(dir);
}
// default sandbox env variables
void env_defaults(void) {
// Qt fixes
if (setenv("QT_X11_NO_MITSHM", "1", 1) < 0)
errExit("setenv");
if (setenv("QML_DISABLE_DISK_CACHE", "1", 1) < 0)
errExit("setenv");
// if (setenv("QTWEBENGINE_DISABLE_SANDBOX", "1", 1) < 0)
// errExit("setenv");
// if (setenv("MOZ_NO_REMOTE, "1", 1) < 0)
// errExit("setenv");
if (setenv("container", "firejail", 1) < 0) // LXC sets container=lxc,
errExit("setenv");
if (!cfg.shell)
cfg.shell = guess_shell();
if (cfg.shell && setenv("SHELL", cfg.shell, 1) < 0)
errExit("setenv");
// spawn KIO slaves inside the sandbox
if (setenv("KDE_FORK_SLAVES", "1", 1) < 0)
errExit("setenv");
// set prompt color to green
int set_prompt = 0;
if (checkcfg(CFG_FIREJAIL_PROMPT))
set_prompt = 1;
else { // check FIREJAIL_PROMPT="yes" environment variable
char *prompt = getenv("FIREJAIL_PROMPT");
if (prompt && strcmp(prompt, "yes") == 0)
set_prompt = 1;
}
if (set_prompt) {
//export PS1='\[\e[1;32m\][\u@\h \W]\$\[\e[0m\] '
if (setenv("PROMPT_COMMAND", "export PS1=\"\\[\\e[1;32m\\][\\u@\\h \\W]\\$\\[\\e[0m\\] \"", 1) < 0)
errExit("setenv");
}
else {
// remove PROMPT_COMMAND
if (setenv("PROMPT_COMMAND", ":", 1) < 0) // unsetenv() will not work here, bash still picks it up from somewhere
errExit("setenv");
}
// set the window title
if (!arg_quiet && isatty(STDOUT_FILENO))
printf("\033]0;firejail %s\007", cfg.window_title);
// pass --quiet as an environment variable, in case the command calls further firejailed commands
if (arg_quiet)
setenv("FIREJAIL_QUIET", "yes", 1);
fflush(0);
}
// parse and store the environment setting
void env_store(const char *str, ENV_OP op) {
EUID_ASSERT();
assert(str);
// some basic checking
if (*str == '\0')
goto errexit;
char *ptr = strchr(str, '=');
if (op == SETENV) {
if (!ptr)
goto errexit;
ptr++;
if (*ptr == '\0')
goto errexit;
}
// build list entry
Env *env = malloc(sizeof(Env));
if (!env)
errExit("malloc");
memset(env, 0, sizeof(Env));
env->name = strdup(str);
if (env->name == NULL)
errExit("strdup");
if (op == SETENV) {
char *ptr2 = strchr(env->name, '=');
assert(ptr2);
*ptr2 = '\0';
env->value = ptr2 + 1;
}
env->op = op;
// add entry to the list
env_add(env);
return;
errexit:
fprintf(stderr, "Error: invalid --env setting\n");
exit(1);
}
// set env variables in the new sandbox process
void env_apply(void) {
Env *env = envlist;
while (env) {
if (env->op == SETENV) {
if (setenv(env->name, env->value, 1) < 0)
errExit("setenv");
}
else if (env->op == RMENV) {
unsetenv(env->name);
}
env = env->next;
}
}
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