C++ (Cpp) create_empty_file_as_root Examples

Example #1

File: preproc.c Project: curiosity-seeker/firejail

// build /run/firejail/mnt directory
void preproc_mount_mnt_dir(void) {
	// mount tmpfs on top of /run/firejail/mnt
	if (!tmpfs_mounted) {
		if (arg_debug)
			printf("Mounting tmpfs on %s directory\n", RUN_MNT_DIR);
		if (mount("tmpfs", RUN_MNT_DIR, "tmpfs", MS_NOSUID | MS_STRICTATIME,  "mode=755,gid=0") < 0)
			errExit("mounting /run/firejail/mnt");
		tmpfs_mounted = 1;
		fs_logger2("tmpfs", RUN_MNT_DIR);

#ifdef HAVE_SECCOMP
		create_empty_dir_as_root(RUN_SECCOMP_DIR, 0755);

		if (arg_seccomp_block_secondary)
			copy_file(PATH_SECCOMP_BLOCK_SECONDARY, RUN_SECCOMP_BLOCK_SECONDARY, getuid(), getgid(), 0644); // root needed
		else {
			//copy default seccomp files
			copy_file(PATH_SECCOMP_32, RUN_SECCOMP_32, getuid(), getgid(), 0644); // root needed
		}
		if (arg_allow_debuggers)
			copy_file(PATH_SECCOMP_DEFAULT_DEBUG, RUN_SECCOMP_CFG, getuid(), getgid(), 0644); // root needed
		else
			copy_file(PATH_SECCOMP_DEFAULT, RUN_SECCOMP_CFG, getuid(), getgid(), 0644); // root needed

		if (arg_memory_deny_write_execute)
			copy_file(PATH_SECCOMP_MDWX, RUN_SECCOMP_MDWX, getuid(), getgid(), 0644); // root needed
		// as root, create empty RUN_SECCOMP_PROTOCOL and RUN_SECCOMP_POSTEXEC files
		create_empty_file_as_root(RUN_SECCOMP_PROTOCOL, 0644);
		if (set_perms(RUN_SECCOMP_PROTOCOL, getuid(), getgid(), 0644))
			errExit("set_perms");
		create_empty_file_as_root(RUN_SECCOMP_POSTEXEC, 0644);
		if (set_perms(RUN_SECCOMP_POSTEXEC, getuid(), getgid(), 0644))
			errExit("set_perms");
#endif
	}
}

Example #2

File: preproc.c Project: curiosity-seeker/firejail

// build /run/firejail directory
void preproc_build_firejail_dir(void) {
	struct stat s;

	// CentOS 6 doesn't have /run directory
	if (stat(RUN_FIREJAIL_BASEDIR, &s)) {
		create_empty_dir_as_root(RUN_FIREJAIL_BASEDIR, 0755);
	}

	if (stat(RUN_FIREJAIL_DIR, &s)) {
		create_empty_dir_as_root(RUN_FIREJAIL_DIR, 0755);
	}

	if (stat(RUN_FIREJAIL_NETWORK_DIR, &s)) {
		create_empty_dir_as_root(RUN_FIREJAIL_NETWORK_DIR, 0755);
	}

	if (stat(RUN_FIREJAIL_BANDWIDTH_DIR, &s)) {
		create_empty_dir_as_root(RUN_FIREJAIL_BANDWIDTH_DIR, 0755);
	}

	if (stat(RUN_FIREJAIL_NAME_DIR, &s)) {
		create_empty_dir_as_root(RUN_FIREJAIL_NAME_DIR, 0755);
	}

	if (stat(RUN_FIREJAIL_PROFILE_DIR, &s)) {
		create_empty_dir_as_root(RUN_FIREJAIL_PROFILE_DIR, 0755);
	}

	if (stat(RUN_FIREJAIL_X11_DIR, &s)) {
		create_empty_dir_as_root(RUN_FIREJAIL_X11_DIR, 0755);
	}

	if (stat(RUN_FIREJAIL_APPIMAGE_DIR, &s)) {
		create_empty_dir_as_root(RUN_FIREJAIL_APPIMAGE_DIR, 0755);
	}

	if (stat(RUN_FIREJAIL_LIB_DIR, &s)) {
		create_empty_dir_as_root(RUN_FIREJAIL_LIB_DIR, 0755);
	}

	if (stat(RUN_MNT_DIR, &s)) {
		create_empty_dir_as_root(RUN_MNT_DIR, 0755);
	}

	create_empty_file_as_root(RUN_RO_FILE, S_IRUSR);
	create_empty_dir_as_root(RUN_RO_DIR, S_IRUSR);
}

Example #3

File: preproc.c Project: netblue30/firejail

// build /run/firejail/mnt directory
void preproc_mount_mnt_dir(void) {
	// mount tmpfs on top of /run/firejail/mnt
	if (!tmpfs_mounted) {
		if (arg_debug)
			printf("Mounting tmpfs on %s directory\n", RUN_MNT_DIR);
		if (mount("tmpfs", RUN_MNT_DIR, "tmpfs", MS_NOSUID | MS_STRICTATIME | MS_REC,  "mode=755,gid=0") < 0)
			errExit("mounting /run/firejail/mnt");
		tmpfs_mounted = 1;
		fs_logger2("tmpfs", RUN_MNT_DIR);
		
		//copy defaultl seccomp files
		copy_file(PATH_SECCOMP_I386, RUN_SECCOMP_I386, getuid(), getgid(), 0644);
		copy_file(PATH_SECCOMP_AMD64, RUN_SECCOMP_AMD64, getuid(), getgid(), 0644);
		if (arg_allow_debuggers)
			copy_file(PATH_SECCOMP_DEFAULT_DEBUG, RUN_SECCOMP_CFG, getuid(), getgid(), 0644);
		else
			copy_file(PATH_SECCOMP_DEFAULT, RUN_SECCOMP_CFG, getuid(), getgid(), 0644);
			
		// as root, create an empty RUN_SECCOMP_PROTOCOL file
		create_empty_file_as_root(RUN_SECCOMP_PROTOCOL, 0644);
		if (set_perms(RUN_SECCOMP_PROTOCOL, getuid(), getgid(), 0644))
			errExit("set_perms");
	}
}

Example #4

File: fs_hostname.c Project: maces/firejail

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);
}