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/*    Copyright (C) 1998-2003 XIAO, Gang of Universite de Nice - Sophia Antipolis
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 *
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 *  This program is free software; you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation; either version 2 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program; if not, write to the Free Software
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 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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 */
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        /* This file contains user authentification routines */
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void refuse_log(int th);
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void set_module_prefix(void);
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        /* check machine load. 2-threshold system.
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         * Threshold 1: anonymous new session refused.
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         * Threshold 2: New session and anonymous request refused. */
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void check_load(int th)
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{
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    int load, pload;
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    char *p1, *p2, buf[64];
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    char *pp;
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    double dload;
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    pload=0; pp=strchr(loadavg,'/'); if(pp) {
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        for(;pp>loadavg && isdigit(pp[-1]); pp--);
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        pload=atoi(pp);
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        if(pload*12>threshold2+3) {
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            pload_refuse:
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            refuse_log(pload+100); user_error("threshold");
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        }
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    }
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    if(ispriority) goto repcheck; /* priority connections will not be refused. */
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    if(pload*20>threshold1+2) goto pload_refuse;
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    if(th<0 || th>2) goto repcheck;
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        /* Operating system load average facility */
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    if(robot_access && loadavg[0]==0) goto refuse;
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    if(loadavg[0]==0) goto repcheck;
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    p1=find_word_start(loadavg); p2=find_word_end(p1);*p2=0;
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    dload=atof(p1);
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    if(robot_access &&
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       (!finite(dload) || dload>1000 || dload<0 || dload*200>threshold1))
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      goto refuse;
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    if(!finite(dload) || dload<=0 || dload>1000) goto repcheck; /* unreasonable */
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        /* very small 1 min load average */
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    if(dload*200<threshold1) goto repcheck;
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    if(dload*50>threshold2) goto refuse;
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    p1=find_word_start(p2+1);   /* go to second average: 5 min. */
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    *find_word_end(p1)=0;
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    dload=atof(p1);
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    if(!finite(dload) || dload<=0 || dload>1000) goto repcheck; /* unreasonable */
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    load=dload*100;
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    snprintf(buf,sizeof(buf),"%d",load);
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    setvar("wims_server_load",buf);
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        /* cut cpu allowance to 3/4 or half if load is high.
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         * But alarm time is not changed */
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    if(load*3>=threshold1*2) {
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        struct rlimit rlim;
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        rlimit_cpu=(3*rlimit_cpu+1)/4;
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        if(load>=threshold1) rlimit_cpu=(3*rlimit_cpu+1)/4;
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        rlim.rlim_cur=rlim.rlim_max=rlimit_cpu;
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        setrlimit(RLIMIT_CPU,&rlim);
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    }
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    if((th==0 && load*2>threshold1) ||
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       (th==1 && load>threshold1) || (th==2 && load>threshold2)) {
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        refuse:
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        if(new_session && *session_prefix!=0) {
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            remove_tree(session_prefix); remove_tree(s2_prefix);
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        }
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        refuse_log(th); user_error("threshold");
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    }
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    repcheck:
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    if(robot_access) return;
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    if(new_session && *session_prefix!=0 && *remote_addr
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       && hostcquota && strcmp(remote_addr,"127.0.0.1")!=0
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       && !ispriority) {
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            /* overload: */
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        remove_tree(session_prefix); remove_tree(s2_prefix);
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        user_error("overload");
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    }
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}
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        /* User authentification routine, obsolete */
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void auth(void)
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{
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    check_load(1); return;
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}
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#define rafinfono 10
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99
        /* check rapidfire information */
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void checkrafale(void)
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{
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    char *p, *p1, *p2, *sh, *u;
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    char rbuf[MAX_LINELEN+1];
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    time_t rr, rafinfo[rafinfono];
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    int i, t, mm, rafinfocnt;
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    double coef=0.23;
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108
    if(rafalvl<=0) return;
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    p=getvar("module_scoring"); if(p==NULL || strcasecmp(p,"yes")!=0) return;
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    u=getvar("wims_user"); if(u!=NULL && strcmp(u,"supervisor")==0) return;
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    p=getvar("wims_developer"); if(p!=NULL && *p!=0) return;
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    p=getenv("REMOTE_ADDR");if(p!=NULL && strcmp(p,"127.0.0.1")==0) return;
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    p=getvar("session"); if(p!=NULL && strstr(p,"_exam")!=NULL) return;
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    sh=getvar("wims_sheet"); if(sh!=NULL && *sh>'0') coef*=3;
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    p=getvar("wims_rafale"); if(p==NULL) p="";
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    mm=0;
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    for(p1=find_word_start(p),i=0;i<rafinfono && *p1;p1=find_word_start(p2)) {
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        p2=find_word_end(p1); if(*p2) *p2++=0;
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        rr=atol(p1); if(rr<=0 || rr>nowtime) continue;
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        t=coef*rafalvl*pow(i,1+rafalvl*0.05)-(nowtime-rr); if(t>mm) mm=t;
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        rafinfo[i++]=rr;
122
    }
123
    if(mm>0) {
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        if(u!=NULL && *u!=0) user_log("rafale");
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        user_error("rafale");
126
    }
127
    rafinfocnt=i;
128
    snprintf(rbuf,sizeof(rbuf),"%lu",nowtime);
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    for(i=0;i<rafinfocnt;i++) {
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        snprintf(rbuf+strlen(rbuf),sizeof(rbuf)-strlen(rbuf),
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                 " %lu",rafinfo[i]);
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    }
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    force_setvar("wims_rafale",rbuf);
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}
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        /* when score is got: erase 2 rafale information. */
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void lessrafale(void)
138
{
139
    char *p;
140
    double s;
141
    int i;
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    p=getvar("module_score"); if(p==NULL) return;
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    s=atof(p); if(s<3) return;
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    p=getvar("wims_rafale"); if(p==NULL || *p==0) return;
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    for(i=0;i<2;i++) p=find_word_end(find_word_start(p));
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    p=find_word_start(p);
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    force_setvar("wims_rafale",p);
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}
149
 
150
#define ac_class 0x1    /* class access */
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#define ac_exo   0x2    /* access to exercises */
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#define ac_tool  0x4    /* access to tools */
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#define ac_recre 0x8    /* access to recreations */
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#define ac_doc   0x10   /* access to documents */
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#define ac_local 0x20   /* access to local modules */
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#define ac_com   0x40   /* access to commercial modules */
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#define ac_hint  0x80   /* hint command */
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#define ac_sheet 0x100  /* use within a worksheet */
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#define ac_exam  0x200  /* work during an exam */
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        /* Check site's access policy. */
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void access_check(int isclass)
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{
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    char *p, *p1, *p2, *p3, *pp1, *pp2;
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    char cbuf[MAX_LINELEN+1];
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    long int thisaccess, lineaccess, linepol, thispol;
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    int non, refuse;
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169
    if(manageable>=2 || robot_access) return;
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    thisaccess=0;
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    p=getvar(ro_name[ro_module]); if(p==NULL || *p==0) return;
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    if(strncmp(p,"adm/doc",7)==0) thisaccess|=ac_doc;
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    else if(strncmp(p,"adm/",4)==0 || strcmp(p,home_module)==0) return;
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    if(strncmp(p,"local/",6)==0) thisaccess|=ac_local;
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    if(strncmp(p,"com/",4)==0) thisaccess|=ac_com;
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    p=getvar("wims_user");
177
    if(p!=NULL && *p!=0) {
178
        if(!isclass && strcmp(p,"supervisor")!=0) access_check(1);
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        thisaccess|=ac_class;
180
    }
181
    if(isclass) {
182
        if(class_dir[0]==0) return;
183
        accessfile(cbuf,"r","%s/access.conf",class_dir);
184
    }
185
    else accessfile(cbuf,"r",ACCESS_CONF);
186
    if(cbuf[0]==0) return;
187
    if(cmd_type==cmd_hint) thisaccess|=ac_hint;
188
    p1=getvar("wims_accessright"); if(p1!=NULL && *p1!=0) {
189
        p=getvar(ro_name[ro_module]);
190
        for(p1=find_word_start(p1);*p1; p1=find_word_start(p2)) {
191
            p2=find_word_end(p1);
192
            if(strncmp(p,p1,p2-p1)==0) return;
193
        }
194
    }
195
    p=getvar("module_category"); if(p) {
196
        if(strstr(p,"exercise")!=NULL) thisaccess|=ac_exo;
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        if(strstr(p,"tool")!=NULL) thisaccess|=ac_tool;
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        if(strstr(p,"recre")!=NULL) thisaccess|=ac_recre;
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        if(strstr(p,"doc")!=NULL) thisaccess|=ac_doc;
200
    }
201
    for(p1=find_word_start(cbuf);*p1;p1=find_word_start(p2)) {
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        p2=strchr(p1,'\n'); if(p2) *p2++=0; else p2=p1+strlen(p1);
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        if(!myisalpha(*p1)) continue;
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        p3=strchr(p1,':'); if(p3==NULL) continue;
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        *p3++=0; p3=find_word_start(p3); strip_trailing_spaces(p3);
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        refuse=0; if(*p3=='!') {
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            p3=find_word_start(p3+1); refuse=1;
208
        }
209
        if(*p3 && checkhostt(p3)==0) continue;
210
        for(p=p1; *p; p++) {
211
            if(myisalpha(*p)) *p=tolower(*p);
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            else *p=' ';
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        }
214
        lineaccess=thisaccess; linepol=0;
215
        for(pp1=find_word_start(p1); *pp1; pp1=find_word_start(pp2)) {
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            pp2=find_word_end(pp1); if(*pp2) *pp2++=0;
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            if(strncmp(pp1,"non",3)==0) {
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                pp1=find_word_start(pp1+3); non=1;
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            }
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            else non=0;
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            thispol=0;
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            if(strcmp(pp1,"class")==0) {thispol=ac_class; goto nxt;}
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            if(strcmp(pp1,"exo")==0) {thispol=ac_exo; goto nxt;}
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            if(strcmp(pp1,"exercise")==0) {thispol=ac_exo; goto nxt;}
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            if(strcmp(pp1,"tool")==0) {thispol=ac_tool; goto nxt;}
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            if(strcmp(pp1,"recre")==0) {thispol=ac_recre; goto nxt;}
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            if(strcmp(pp1,"recreation")==0) {thispol=ac_recre; goto nxt;}
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            if(strcmp(pp1,"doc")==0) {thispol=ac_doc; goto nxt;}
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            if(strcmp(pp1,"document")==0) {thispol=ac_doc; goto nxt;}
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            if(strcmp(pp1,"local")==0) {thispol=ac_local; goto nxt;}
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            if(strcmp(pp1,"com")==0) {thispol=ac_com; goto nxt;}
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            if(strcmp(pp1,"hint")==0) {thispol=ac_hint; goto nxt;}
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            nxt:
234
            if(thispol==0) continue;
235
            if(non) lineaccess^=thispol;
236
            linepol|=thispol;
237
        }
238
        if(linepol==0 || (linepol&lineaccess)!=linepol) continue;
239
        if(refuse) user_error("no_access");
240
        else return;
241
    }
242
}
243