static void
exec_child(struct master_service_connection *conn, const char *const *args)
{
unsigned int i, socket_count;
if (dup2(conn->fd, STDIN_FILENO) < 0)
i_fatal("dup2() failed: %m");
if (dup2(conn->fd, STDOUT_FILENO) < 0)
i_fatal("dup2() failed: %m");
/* close all fds */
socket_count = master_service_get_socket_count(master_service);
for (i = 0; i < socket_count; i++) {
if (close(MASTER_LISTEN_FD_FIRST + i) < 0)
i_error("close(listener) failed: %m");
}
if (close(MASTER_STATUS_FD) < 0)
i_error("close(status) failed: %m");
if (close(conn->fd) < 0)
i_error("close(conn->fd) failed: %m");
for (; *args != NULL; args++)
array_append(&exec_args, args, 1);
array_append_zero(&exec_args);
env_clean();
args = array_idx(&exec_args, 0);
execvp_const(args[0], args);
}
static void
run_cmd(struct dsync_cmd_context *ctx, const char *const *args)
{
int fd_in[2], fd_out[2], fd_err[2];
if (pipe(fd_in) < 0 || pipe(fd_out) < 0 || pipe(fd_err) < 0)
i_fatal("pipe() failed: %m");
ctx->remote_pid = fork();
switch (ctx->remote_pid) {
case -1:
i_fatal("fork() failed: %m");
case 0:
/* child, which will execute the proxy server. stdin/stdout
goes to pipes which we'll pass to proxy client. */
if (dup2(fd_in[0], STDIN_FILENO) < 0 ||
dup2(fd_out[1], STDOUT_FILENO) < 0 ||
dup2(fd_err[1], STDERR_FILENO) < 0)
i_fatal("dup2() failed: %m");
i_close_fd(&fd_in[0]);
i_close_fd(&fd_in[1]);
i_close_fd(&fd_out[0]);
i_close_fd(&fd_out[1]);
i_close_fd(&fd_err[0]);
i_close_fd(&fd_err[1]);
execvp_const(args[0], args);
default:
/* parent */
break;
}
i_close_fd(&fd_in[0]);
i_close_fd(&fd_out[1]);
i_close_fd(&fd_err[1]);
ctx->fd_in = fd_out[0];
ctx->fd_out = fd_in[1];
ctx->fd_err = fd_err[0];
if (ctx->remote_user_prefix) {
const char *prefix =
t_strdup_printf("%s\n", ctx->ctx.cur_username);
if (write_full(ctx->fd_out, prefix, strlen(prefix)) < 0)
i_fatal("write(remote out) failed: %m");
}
fd_set_nonblock(ctx->fd_err, TRUE);
ctx->err_stream = i_stream_create_fd(ctx->fd_err, IO_BLOCK_SIZE, FALSE);
i_stream_set_return_partial_line(ctx->err_stream, TRUE);
}
static void client_connected(struct master_service_connection *conn)
{
enum mail_storage_service_flags flags =
MAIL_STORAGE_SERVICE_FLAG_NO_PLUGINS;
string_t *instr, *keys;
const char **args, *key, *value, *error, *version_line, *data_line;
struct mail_storage_service_ctx *service_ctx;
struct mail_storage_service_input input;
struct mail_storage_service_user *user;
char buf[1024];
unsigned int i, socket_count;
int fd = -1;
ssize_t ret;
alarm(SCRIPT_LOGIN_READ_TIMEOUT_SECS);
net_set_nonblock(conn->fd, FALSE);
instr = t_str_new(1024);
ret = fd_read(conn->fd, buf, sizeof(buf), &fd);
while (ret > 0) {
str_append_n(instr, buf, ret);
if (buf[ret-1] == '\n' &&
strchr(str_c(instr), '\n')[1] != '\0') {
str_truncate(instr, str_len(instr)-1);
break;
}
ret = read(conn->fd, buf, sizeof(buf));
}
version_line = str_c(instr);
data_line = strchr(version_line, '\n');
if (data_line != NULL)
version_line = t_strdup_until(version_line, data_line++);
else
version_line = NULL;
if (ret > 0 || version_line != NULL) {
if (version_line == NULL ||
!version_string_verify(version_line, "script-login",
SCRIPT_LOGIN_PROTOCOL_VERSION_MAJOR)) {
i_fatal("Client not compatible with this binary "
"(connecting to wrong socket?)");
}
}
if (ret <= 0) {
if (ret < 0)
i_fatal("read() failed: %m");
else
i_fatal("read() failed: disconnected");
}
if (fd == -1)
i_fatal("client fd not received");
alarm(0);
/* put everything to environment */
env_clean();
keys = t_str_new(256);
args = t_strsplit_tab(data_line);
if (str_array_length(args) < 3)
i_fatal("Missing input fields");
i = 0;
memset(&input, 0, sizeof(input));
input.module = "mail"; /* need to get mail_uid, mail_gid */
input.service = "script-login";
(void)net_addr2ip(args[i++], &input.local_ip);
(void)net_addr2ip(args[i++], &input.remote_ip);
input.username = args[i++];
input.userdb_fields = args + i;
env_put(t_strconcat("LOCAL_IP=", net_ip2addr(&input.local_ip), NULL));
env_put(t_strconcat("IP=", net_ip2addr(&input.remote_ip), NULL));
env_put(t_strconcat("USER="******"%s ", key);
}
}
env_put(t_strconcat(ENV_USERDB_KEYS"=", str_c(keys), NULL));
master_service_init_log(master_service,
t_strdup_printf("script-login(%s): ", input.username));
if (drop_to_userdb_privileges) {
service_ctx = mail_storage_service_init(master_service, NULL, flags);
if (mail_storage_service_lookup(service_ctx, &input, &user, &error) <= 0)
i_fatal("%s", error);
mail_storage_service_restrict_setenv(service_ctx, user);
/* we can't exec anything in a chroot */
env_remove("RESTRICT_CHROOT");
restrict_access_by_env(getenv("HOME"), TRUE);
}
if (dup2(fd, STDIN_FILENO) < 0)
i_fatal("dup2() failed: %m");
if (dup2(fd, STDOUT_FILENO) < 0)
i_fatal("dup2() failed: %m");
if (close(fd) < 0)
i_fatal("close() failed: %m");
if (conn->fd != SCRIPT_COMM_FD) {
if (dup2(conn->fd, SCRIPT_COMM_FD) < 0)
i_fatal("dup2() failed: %m");
if (close(conn->fd) < 0)
i_fatal("close() failed: %m");
}
/* close all listener sockets */
socket_count = master_service_get_socket_count(master_service);
for (i = 0; i < socket_count; i++) {
if (close(MASTER_LISTEN_FD_FIRST + i) < 0)
i_error("close(listener) failed: %m");
}
if (close(MASTER_STATUS_FD) < 0)
i_error("close(status) failed: %m");
execvp_const(exec_args[0], exec_args);
}
static void exec_child
(const char *bin_path, const char *const *args, const char *const *envs,
int in_fd, int out_fd, int *extra_fds, bool drop_stderr)
{
ARRAY_TYPE(const_string) exec_args;
/* Setup stdin/stdout */
if ( in_fd < 0 ) {
in_fd = open("/dev/null", O_RDONLY);
if ( in_fd == -1 )
i_fatal("open(/dev/null) failed: %m");
}
if ( out_fd < 0 ) {
out_fd = open("/dev/null", O_WRONLY);
if ( out_fd == -1 )
i_fatal("open(/dev/null) failed: %m");
}
if ( dup2(in_fd, STDIN_FILENO) < 0 )
i_fatal("dup2(stdin) failed: %m");
if ( dup2(out_fd, STDOUT_FILENO) < 0 )
i_fatal("dup2(stdout) failed: %m");
if ( close(in_fd) < 0 )
i_error("close(in_fd) failed: %m");
if ( (out_fd != in_fd) && close(out_fd) < 0 )
i_error("close(out_fd) failed: %m");
/* Drop stderr if requested */
if ( drop_stderr ) {
int err_fd = open("/dev/null", O_WRONLY);
if ( err_fd == -1 )
i_fatal("open(/dev/null) failed: %m");
if ( dup2(err_fd, STDERR_FILENO) < 0 )
i_fatal("dup2(stderr) failed: %m");
if ( close(err_fd) < 0 )
i_error("close(err_fd) failed: %m");
}
/* Setup extra fds */
if ( extra_fds != NULL ) {
for (; *extra_fds != -1; extra_fds += 2 ) {
if ( dup2(extra_fds[0], extra_fds[1]) < 0 )
i_fatal("dup2(extra_fd=%d) failed: %m", extra_fds[1]);
if ( close(extra_fds[0]) < 0 )
i_error("close(extra_fd=%d) failed: %m", extra_fds[1]);
}
}
/* Compose argv */
t_array_init(&exec_args, 16);
array_append(&exec_args, &bin_path, 1);
if ( args != NULL ) {
for (; *args != NULL; args++)
array_append(&exec_args, args, 1);
}
(void)array_append_space(&exec_args);
/* Setup environment */
env_clean();
if ( envs != NULL ) {
for (; *envs != NULL; envs++)
env_put(*envs);
}
/* Execute */
args = array_idx(&exec_args, 0);
execvp_const(args[0], args);
}
