/**
* Read result of the authenticator sub-process from pipe
*
* @param r_fd File descriptor of the pipe.
* @param events (ignored IO specification)
*/
static void
cb_Read_Auth_Result(int r_fd, UNUSED short events)
{
char user[CLIENT_USER_LEN], *ptr;
CONN_ID conn;
CLIENT *client;
int result;
size_t len;
PROC_STAT *proc;
LogDebug("Auth: Got callback on fd %d, events %d", r_fd, events);
conn = Conn_GetFromProc(r_fd);
if (conn == NONE) {
/* Ops, none found? Probably the connection has already
* been closed!? We'll ignore that ... */
io_close(r_fd);
LogDebug("Auth: Got callback for unknown connection!?");
return;
}
proc = Conn_GetProcStat(conn);
client = Conn_GetClient(conn);
/* Read result from pipe */
len = Proc_Read(proc, &result, sizeof(result));
Proc_Close(proc);
if (len == 0)
return;
if (len != sizeof(result)) {
Log(LOG_CRIT, "Auth: Got malformed result!");
Client_Reject(client, "Internal error", false);
return;
}
if (result == true) {
/* Authentication succeeded, now set the correct user name
* supplied by the client (without prepended '~' for exmaple),
* but cut it at the first '@' character: */
strlcpy(user, Client_OrigUser(client), sizeof(user));
ptr = strchr(user, '@');
if (ptr)
*ptr = '\0';
Client_SetUser(client, user, true);
(void)Login_User_PostAuth(client);
} else
Client_Reject(client, "Bad password", false);
}
/**
* Check if a client is banned from this server: GLINE, KLINE.
*
* If a client isn't allowed to connect, it will be disconnected again.
*
* @param Client The client to check.
* @return CONNECTED if client is allowed to join, DISCONNECTED if not.
*/
GLOBAL bool
Class_HandleServerBans(CLIENT *Client)
{
char *rejectptr;
assert(Client != NULL);
rejectptr = Class_GetMemberReason(CLASS_GLINE, Client);
if (!rejectptr)
rejectptr = Class_GetMemberReason(CLASS_KLINE, Client);
if (rejectptr) {
Client_Reject(Client, rejectptr, true);
return DISCONNECTED;
}
return CONNECTED;
}
/**
* Initiate client login.
*
* This function is called after the daemon received the required NICK and
* USER commands of a new client. If the daemon is compiled with support for
* PAM, the authentication sub-processs is forked; otherwise the global server
* password is checked.
*
* @param Client The client logging in.
* @returns CONNECTED or DISCONNECTED.
*/
GLOBAL bool
Login_User(CLIENT * Client)
{
#ifdef PAM
int pipefd[2], result;
pid_t pid;
#endif
CONN_ID conn;
assert(Client != NULL);
conn = Client_Conn(Client);
#ifndef STRICT_RFC
if (Conf_AuthPing) {
/* Did we receive the "auth PONG" already? */
if (Conn_GetAuthPing(conn)) {
Client_SetType(Client, CLIENT_WAITAUTHPING);
LogDebug("Connection %d: Waiting for AUTH PONG ...", conn);
return CONNECTED;
}
}
#endif
/* Still waiting for "CAP END" command? */
if (Client_Cap(Client) & CLIENT_CAP_PENDING) {
Client_SetType(Client, CLIENT_WAITCAPEND);
LogDebug("Connection %d: Waiting for CAP END ...", conn);
return CONNECTED;
}
#ifdef PAM
if (!Conf_PAM) {
/* Don't do any PAM authentication at all if PAM is not
* enabled, instead emulate the behavior of the daemon
* compiled without PAM support. */
if (strcmp(Conn_Password(conn), Conf_ServerPwd) == 0)
return Login_User_PostAuth(Client);
Client_Reject(Client, "Bad server password", false);
return DISCONNECTED;
}
if (Conf_PAMIsOptional &&
strcmp(Conn_Password(conn), "") == 0) {
/* Clients are not required to send a password and to be PAM-
* authenticated at all. If not, they won't become "identified"
* and keep the "~" in their supplied user name.
* Therefore it is sensible to either set Conf_PAMisOptional or
* to enable IDENT lookups -- not both. */
return Login_User_PostAuth(Client);
}
if (Conf_PAM) {
/* Fork child process for PAM authentication; and make sure that the
* process timeout is set higher than the login timeout! */
pid = Proc_Fork(Conn_GetProcStat(conn), pipefd,
cb_Read_Auth_Result, Conf_PongTimeout + 1);
if (pid > 0) {
LogDebug("Authenticator for connection %d created (PID %d).",
conn, pid);
return CONNECTED;
} else {
/* Sub process */
Log_Init_Subprocess("Auth");
Conn_CloseAllSockets(NONE);
result = PAM_Authenticate(Client);
if (write(pipefd[1], &result, sizeof(result)) != sizeof(result))
Log_Subprocess(LOG_ERR,
"Failed to pipe result to parent!");
Log_Exit_Subprocess("Auth");
exit(0);
}
} else return CONNECTED;
#else
/* Check global server password ... */
if (strcmp(Conn_Password(conn), Conf_ServerPwd) != 0) {
/* Bad password! */
Client_Reject(Client, "Bad server password", false);
return DISCONNECTED;
}
return Login_User_PostAuth(Client);
#endif
}
