STREAM *STREAMSpawnFunction(BASIC_FUNC Func, void *Data, const char *Config)
{
int to_fd, from_fd, *iptr;
pid_t pid=0;
STREAM *S=NULL;
char *Tempstr=NULL;
int Flags=0;
Flags=TTYParseConfig(Config, NULL);
if (Flags & TTYFLAG_PTY)
{
pid=PseudoTTYSpawnFunction(&to_fd, Func, Data, Flags, Config);
from_fd=to_fd;
}
else
{
iptr=NULL;
//if (Flags & COMMS_COMBINE_STDERR) iptr=(int *) COMMS_COMBINE_STDERR;
pid=PipeSpawnFunction(&to_fd, &from_fd, iptr, Func, Data, Config);
}
if (pid > 0) S=STREAMFromDualFD(from_fd, to_fd);
if (S)
{
STREAMSetFlushType(S,FLUSH_LINE,0,0);
Tempstr=FormatStr(Tempstr,"%d",pid);
STREAMSetValue(S,"PeerPID",Tempstr);
S->Type=STREAM_TYPE_PIPE;
}
DestroyString(Tempstr);
return(S);
}
pid_t PseudoTTYSpawn(int *pty, const char *Command, const char *Config)
{
return(PseudoTTYSpawnFunction(pty, BASIC_FUNC_EXEC_COMMAND, (void *) Command, TTYParseConfig(Config, NULL), Config));
}
pid_t PseudoTTYSpawn(int *pty, const char *Command, int Flags, const char *Config)
{
return(PseudoTTYSpawnFunction(pty, BASIC_FUNC_EXEC_COMMAND, (void *) Command, Flags, Config));
}
pid_t PseudoTTYSpawn(int *pty, const char *Command, const char *User, const char *Group, int TTYFlags)
{
return(PseudoTTYSpawnFunction(pty, BASIC_FUNC_EXEC_COMMAND, (void *) Command, User, Group, TTYFlags));
}
void RunTelnetSession(TSession *Session)
{
STREAM *Local, *S;
char *Tempstr=NULL;
int result, fd;
ListNode *Streams;
struct passwd *pwent;
struct group *grent;
struct timeval tv;
time_t Duration, Start, Now, LastActivity;
time(&Start);
LastActivity=Start;
Streams=ListCreate();
ListAddItem(Streams,Session->S);
//if '-real-user' was specified on the command-line, then this overrides
//anything read from password files
if (Settings.Flags & FLAG_FORCE_REALUSER)
{
Session->RealUser=CopyStr(Session->RealUser,Settings.RealUser);
}
//Get User Details before we chroot!
if (StrLen(Session->RealUser))
{
pwent=getpwnam(Session->RealUser);
if (! pwent)
{
syslog(Settings.InfoLogLevel,"Failed to lookup RealUser '%s' for user '%s'",Session->RealUser,Session->User);
exit(1);
}
Session->RealUserUID=pwent->pw_uid;
Session->GroupID=pwent->pw_gid;
}
//if '-shell' was specified on the command-line, then this overrides
//anything read from password files
if (Settings.Flags & FLAG_FORCE_SHELL)
{
Session->Shell=CopyStr(Session->Shell,Settings.RealUser);
}
if (Settings.Flags & FLAG_DYNHOME)
{
Session->HomeDir=SessionSubstituteVars(Session->HomeDir,Settings.DynamicHomeDir,Session);
Session->HomeDir=SlashTerminateDirectoryPath(Session->HomeDir);
MakeDirPath(Session->HomeDir,0777);
}
//CD to the user's home directory
if (StrLen(Session->HomeDir))
{
chdir(Session->HomeDir);
}
DoBindMounts(Settings.BindMounts,0);
//This login script allows setting up any aspects of the environment before we launch the shell. For instance it
//might be used to copy files into the chroot environment before chrooting
if (StrLen(Settings.LoginScript)) system(Settings.LoginScript);
//LAUNCH THE SHELL FUNCTION!!! This launches the program that the telnet user is 'speaking' to.
//If chhome is active, then it will be chrooted into the user's home directory
PseudoTTYSpawnFunction(&fd, LaunchPtyFunc, Session, TTYFLAG_CANON | TTYFLAG_ECHO | TTYFLAG_CRLF | TTYFLAG_LFCR | TTYFLAG_IGNSIG);
Local=STREAMFromFD(fd);
STREAMSetTimeout(Local,0);
//Might as well chroot on this side of the pipe too, unless we have a 'LogoutScript'
//Logout scripts exist to allow copying stuff back out of the chroot when the session is
//finished. We can't do this if we chroot this side as well as the 'shell' side
if (
(! StrLen(Settings.LogoutScript)) &&
(Settings.Flags & FLAG_CHHOME)
) chroot(".");
//DON'T SWITCH USER. NEED root TO UNBIND MOUNTS
//if (setreuid(Session->RealUserUID,Session->RealUserUID) !=0) exit(1);
ListAddItem(Streams,Local);
Tempstr=SetStrLen(Tempstr,4096);
while (1)
{
if (Settings.IdleTimeout) tv.tv_sec=Settings.IdleTimeout;
else tv.tv_sec=3600 * 24;
S=STREAMSelect(Streams,&tv);
time(&Now);
if (S)
{
if (S==Session->S)
{
result=TelnetReadBytes(Session->S, Tempstr, 4096, TNRB_NONBLOCK);
if (result ==-1) break;
STREAMWriteBytes(Local,Tempstr,result);
}
else
{
result=STREAMReadBytes(Local,Tempstr,4096);
if (result < 0) break;
STREAMWriteBytes(Session->S,Tempstr,result);
if (result < 0) break;
}
if (Settings.Flags & FLAG_WINSIZE) SetWindowSize(Session->S->out_fd);
LastActivity=Now;
}
if ((Settings.IdleTimeout > 0) && ((Now - LastActivity) > Settings.IdleTimeout)) break;
}
if (StrLen(Settings.LogoutScript)) system(Settings.LogoutScript);
if (Settings.Flags & FLAG_UNMOUNT) UndoBindMounts(Settings.BindMounts, 0);
if (Settings.Flags & FLAG_DYNHOME) rmdir(Session->HomeDir);
Duration=time(NULL) - Start;
syslog(Settings.InfoLogLevel,"%s@%s logged out after %d secs",Session->User,Session->ClientIP, Duration);
STREAMClose(Session->S);
STREAMClose(Local);
DestroyString(Tempstr);
}