Subversion Repositories wimsdev

/*    Copyright (C) 1998-2003 XIAO, Gang of Universite de Nice - Sophia Antipolis

 *

 *  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., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

/* This file contains user authentification routines */

#include "wims.h"

void refuse_log(int th);

void set_module_prefix(void);

/* check machine load. 2-threshold system.

 * Threshold 1: anonymous new session refused.

 * Threshold 2: New session and anonymous request refused.

 */

void check_load(int th)

{

  int load, pload;

  char *p1, *p2, buf[64];

  char *pp;

  double dload;

  pload=0; pp=strchr(loadavg,'/'); if(pp) {

    for(;pp>loadavg && isdigit(pp[-1]); pp--);

    pload=atoi(pp);

    if(pload*12>threshold2+3) {

      pload_refuse:

      refuse_log(pload+100); user_error("threshold");

    }

  }

  if(ispriority) goto repcheck; /* priority connections will not be refused. */

  if(pload*20>threshold1+2) goto pload_refuse;

  if(th<0 || th>2) goto repcheck;

  /* Operating system load average facility */

  if(robot_access && loadavg[0]==0) goto refuse;

  if(loadavg[0]==0) goto repcheck;

  p1=find_word_start(loadavg); p2=find_word_end(p1);*p2=0;

  dload=atof(p1);

  if(robot_access && (!isfinite(dload) || dload>1000 || dload<0 || dload*200>threshold1))

    goto refuse;

  if(!isfinite(dload) || dload<=0 || dload>1000) goto repcheck; /* unreasonable */

  /* very small 1 min load average */

  if(dload*200<threshold1) goto repcheck;

  if(dload*50>threshold2) goto refuse;

  p1=find_word_start(p2+1); /* go to second average: 5 min. */

  *find_word_end(p1)=0;

  dload=atof(p1);

  if(!isfinite(dload) || dload<=0 || dload>1000) goto repcheck; /* unreasonable */

  load=dload*100;

  snprintf(buf,sizeof(buf),"%d",load);

  setvar("wims_server_load",buf);

  /* cut cpu allowance to 3/4 or half if load is high.

   * But alarm time is not changed */

  if(load*3>=threshold1*2) {

    struct rlimit rlim;

    rlimit_cpu=(3*rlimit_cpu+1)/4;

    if(load>=threshold1) rlimit_cpu=(3*rlimit_cpu+1)/4;

    rlim.rlim_cur=rlim.rlim_max=rlimit_cpu;

    setrlimit(RLIMIT_CPU,&rlim);

  }

  if((th==0 && load*2>threshold1) ||

     (th==1 && load>threshold1) || (th==2 && load>threshold2)) {

    refuse:

  if(new_session && *session_prefix!=0) {

      remove_tree(session_prefix); remove_tree(s2_prefix);

    }

    refuse_log(th); user_error("threshold");

  }

  repcheck:

  if(robot_access) return;

  if(new_session && *session_prefix!=0 && *remote_addr

     && hostcquota && strcmp(remote_addr,"127.0.0.1")!=0

     && !ispriority) {

    /* overload: */

    remove_tree(session_prefix); remove_tree(s2_prefix);

    user_error("overload");

  }

}

/* User authentification routine, obsolete */

void auth(void)

{

  check_load(1); return;

}

#define rafinfono 10

/* check rapidfire information */

void checkrafale(void)

{

  char *p, *p1, *p2, *sh, *u;

  char rbuf[MAX_LINELEN+1];

  time_t rr, rafinfo[rafinfono];

  int i, t, mm, rafinfocnt;

  double coef=0.23;

  if(rafalvl<=0) return;

  p=getvar("module_scoring"); if(p==NULL || strcasecmp(p,"yes")!=0) return;

  u=getvar("wims_user"); if(u!=NULL && strcmp(u,"supervisor")==0) return;

  p=getvar("wims_developer"); if(p!=NULL && *p!=0) return;

  p=getenv("REMOTE_ADDR");if(p!=NULL && strcmp(p,"127.0.0.1")==0) return;

  p=getvar("session"); if(p!=NULL && strstr(p,"_exam")!=NULL) return;

  sh=getvar("wims_sheet"); if(sh!=NULL && *sh>'0') coef*=3;

  p=getvar("wims_rafale"); if(p==NULL) p="";

  mm=0;

  for(p1=find_word_start(p),i=0;i<rafinfono && *p1;p1=find_word_start(p2)) {

   p2=find_word_end(p1); if(*p2) *p2++=0;

   rr=atol(p1); if(rr<=0 || rr>nowtime) continue;

   t=coef*rafalvl*pow(i,1+rafalvl*0.05)-(nowtime-rr); if(t>mm) mm=t;

   rafinfo[i++]=rr;

  }

  if(mm>0) {

    if(u!=NULL && *u!=0) user_log("rafale");

    user_error("rafale");

  }

  rafinfocnt=i;

  snprintf(rbuf,sizeof(rbuf),"%lu",nowtime);

  for(i=0;i<rafinfocnt;i++) {

    snprintf(rbuf+strlen(rbuf),sizeof(rbuf)-strlen(rbuf),

         " %lu",rafinfo[i]);

  }

  force_setvar("wims_rafale",rbuf);

}

/* when score is got: erase 2 rafale information. */

void lessrafale(void)

{

  char *p;

  double s;

  int i;

  p=getvar("module_score"); if(p==NULL) return;

  s=atof(p); if(s<3) return;

  p=getvar("wims_rafale"); if(p==NULL || *p==0) return;

  for(i=0;i<2;i++) p=find_word_end(find_word_start(p));

  p=find_word_start(p);

  force_setvar("wims_rafale",p);

}

#define ac_class 0x1  /* class access */

#define ac_exo   0x2  /* access to exercises */

#define ac_tool  0x4  /* access to tools */

#define ac_recre 0x8  /* access to recreations */

#define ac_doc  0x10  /* access to documents */

#define ac_local 0x20 /* access to local modules */

#define ac_com   0x40 /* access to commercial modules */

#define ac_hint  0x80 /* hint command */

#define ac_sheet 0x100/* use within a worksheet */

#define ac_exam  0x200/* work during an exam */

#define ac_freew  0x400/* work during a freework */

/* Check site or class access policy. */

void access_check(int isclass)

{

  char *p, *p1, *p2, *p3, *pp1, *pp2;

  char msg[200], *name="";

  char cbuf[MAX_LINELEN+1];

  long int thisaccess, lineaccess, linepol, thispol;

  int non, refuse;

  if(manageable>=2 || robot_access) return;

  thisaccess=0;

  p=getvar(ro_name[ro_module]); if(p==NULL || *p==0) return;

  if(strncmp(p,"adm/doc",7)==0) thisaccess|=ac_doc;

  else if(strncmp(p,"adm/class/freeworks",17)==0) thisaccess|=ac_freew;

  else if(strncmp(p,"adm/",4)==0 || strcmp(p,home_module)==0) return;

  if(strncmp(p,"local/",6)==0) thisaccess|=ac_local;

  if(strncmp(p,"com/",4)==0) thisaccess|=ac_com;

  p=getvar("wims_user");

  if(p!=NULL && *p!=0) {

    if(!isclass && strcmp(p,"supervisor")!=0) access_check(1);

    thisaccess|=ac_class;

  }

  if(isclass) {

    if(class_dir[0]==0) return;

    accessfile(cbuf,"r","%s/access.conf",class_dir);

  }

  else accessfile(cbuf,"r",ACCESS_CONF);

  if(cbuf[0]==0) return;

  /* access limited */

  if(cmd_type==cmd_hint) thisaccess|=ac_hint;

  p1=getvar("wims_accessright"); if(p1!=NULL && *p1!=0) {

    p=getvar(ro_name[ro_module]);

    for(p1=find_word_start(p1);*p1; p1=find_word_start(p2)) {

      p2=find_word_end(p1);

      if(strncmp(p,p1,p2-p1)==0) return;

    }

  }

  p=getvar("module_category");

  if(p) {

    if(strstr(p,"exercise")!=NULL) thisaccess|=ac_exo;

    if(strstr(p,"tool")!=NULL) thisaccess|=ac_tool;

    if(strstr(p,"recre")!=NULL) thisaccess|=ac_recre;

    if(strstr(p,"doc")!=NULL) thisaccess|=ac_doc;

  }

  for(p1=find_word_start(cbuf);*p1;p1=find_word_start(p2)) {

    p2=strchr(p1,'\n'); if(p2) *p2++=0; else p2=p1+strlen(p1);

    if(!myisalpha(*p1)) continue;

    p3=strchr(p1,':'); if(p3==NULL) continue;

    *p3++=0; p3=find_word_start(p3); strip_trailing_spaces(p3);

    refuse=0;

    if(*p3=='!') { p3=find_word_start(p3+1); refuse=1;}

    if(*p3 && checkhostt(p3)==0) continue;

    for(p=p1; *p; p++) {

      if(myisalpha(*p)) *p=tolower(*p); else *p=' ';

    }

    lineaccess=thisaccess; linepol=0;

    for(pp1=find_word_start(p1); *pp1; pp1=find_word_start(pp2)) {

      pp2=find_word_end(pp1); if(*pp2) *pp2++=0;

      if(strncmp(pp1,"non",3)==0) {

        pp1=find_word_start(pp1+3); non=1;

      }  else non=0;

      thispol=0;

      if(strcmp(pp1,"class")==0) {thispol=ac_class; name="class"; goto nxt;}

      if(strcmp(pp1,"exo")==0) {thispol=ac_exo; name="exo"; goto nxt;}

      if(strcmp(pp1,"exercise")==0) {thispol=ac_exo; name="exo"; goto nxt;}

      if(strcmp(pp1,"tool")==0) {thispol=ac_tool; name="tool"; goto nxt;}

      if(strcmp(pp1,"recre")==0) {thispol=ac_recre; name="recre"; goto nxt;}

      if(strcmp(pp1,"recreation")==0) {thispol=ac_recre; name="recre"; goto nxt;}

      if(strcmp(pp1,"doc")==0) {thispol=ac_doc; name="doc"; goto nxt;}

      if(strcmp(pp1,"document")==0) {thispol=ac_doc; name="doc"; goto nxt;}

      if(strcmp(pp1,"freework")==0) {thispol=ac_freew; name="freework"; goto nxt;}

      if(strcmp(pp1,"local")==0) {thispol=ac_local; name="local"; goto nxt;}

      if(strcmp(pp1,"com")==0) {thispol=ac_com; name="com"; goto nxt;}

      if(strcmp(pp1,"hint")==0) {thispol=ac_hint; name="hint"; goto nxt;}

      nxt:

      if(thispol==0) continue;

      if(non) lineaccess^=thispol;

      linepol|=thispol;

    }

    if(linepol==0 || (linepol&lineaccess)!=linepol) continue;

    snprintf(msg,200,"no_access_class %s",name);

    if(refuse)

      if (isclass) user_error(msg); else user_error("no_access");

    else return;

  }

  /* end of limited access */

}