/*
Copyright (c) 2010, Dirk Krause
All rights reserved.

Redistribution and use in source and binary forms,
with or without modification, are permitted provided
that the following conditions are met:

* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.
* Redistributions in binary form must reproduce the above 
  opyright notice, this list of conditions and the following
  disclaimer in the documentation and/or other materials
  provided with the distribution.
* Neither the name of the Dirk Krause nor the names of
  contributors may be used to endorse or promote
  products derived from this software without specific
  prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.
*/



/** @file uabesys.c	System backend. */



/** In the uabesys module. */
#define UABESYS_C	1



#include "useraudi.h"



$(trace-include)



/**	Retrieve information about a user account.
	@param	uac	UAC structure.
	@param	uab	Backend to ask.
	@param	a	API structure to communicate to backend.
*/
static
void
find_user DK_P3(UAC *,uac, UAB *,uab, UAB_API *,a) {
  struct passwd *pw = NULL;
  struct spwd *sp = NULL;
  struct group *gr;
  UAU *u = NULL;
  int have_error = 0;
  int cc;
  int ingroup;
  char **grmemptr;
  UAG *ge;
  char *x;
  $? "+ find_user"
  pw = uat_getpwnam((a->a).v);
  if(pw) {				$? ". pw entry ok"
    sp = uat_getspnam((a->a).v);
    if(sp) {				$? ". shadow entry ok"
      if(sp->sp_pwdp) {			$? ". password hash available"
	u = uau_new((a->a).v);
	if(u) {				$? ". UAU allocated"
	  u->pw_hash = dkstr_dup(sp->sp_pwdp);
	  u->ht = uab->ht;
	  u->st = uab->st;
	  u->sl = uab->sl;
	  if((u->user_name) && (u->pw_hash)) {	$? ". pw hash allocated"
	    x = dkstr_chr(u->pw_hash, ',');
	    if(x) { *x = '\0'; }
	    if(u->ht == USERAUD_HASH_CRYPT) {	$? ". correct salt length"
	      uatcs_correct_crypt_st_sl(uac, &(u->st), &(u->sl), u->pw_hash);
	    }
	    if(((a->a).f) & 1) {		$? ". detailed search (start)"
	      u->uid = pw->pw_uid;
	      if(pw->pw_gecos) {		$? ". keep gecos"
	        u->gecos = dkstr_dup(pw->pw_gecos);
		if(!(u->gecos)) {		$? "! memory"
		  have_error = 1;
		}
	      }
	      u->primary_group = pw->pw_gid;
#if DK_HAVE_GETGRENT
	      $? ". before traversing groups"
#if DK_HAVE_SETGRENT
	      setgrent();
#endif
	      cc = 1;
	      while(cc && useraud_get_outer_loop()) {
	        cc = 0;
		gr = getgrent();
		if(gr) {			$? ". group found"
		  cc = 1;
		  if(gr->gr_gid == u->primary_group) {	$? ". primary group"
		    if(gr->gr_name) {
		      if(u->pg_name) {
		        x = u->pg_name; dk_delete(x); u->pg_name = NULL;
		      }
		      u->pg_name = dkstr_dup(gr->gr_name);
		      if(!(u->pg_name)) {
		        have_error = 1;
		      }
		    }
		  } else {			$? ". not primary group"
		    ingroup = 0;
		    if(gr->gr_mem) {
		      grmemptr = gr->gr_mem;
		      while((ingroup == 0) && (*grmemptr)) { $? "\"%s\"<=>\"%s\"", (a->a).v, *grmemptr
		        if(strcmp((a->a).v, *grmemptr) == 0) {
			  ingroup = 1;		$? ". in group"
			}
		        grmemptr++;
		      }
		    }
		    if(ingroup) {		$? ". in group"
		      if(gr->gr_name) {
		        if(!(u->s_g)) {
		          u->s_g = dksto_open(0);
			  if(u->s_g) {
			    u->i_g = dksto_it_open(u->s_g);
			    if(!(u->i_g)) have_error = 1;
			  } else {
			    have_error = 1;
			  }
		        }
		        if((u->s_g) && (u->i_g)) {	$? ". save group"
		          ge = uau_group_new(gr->gr_name, gr->gr_gid);
			  if(ge) {			$? ". allocated"
			    if(!dksto_add(u->s_g, (void *)ge)) {	$? "! memory"
			      uau_group_delete(ge); ge = NULL; have_error = 1;
			    }
			  }
		        }
		      }
		    }
		  }
		}
	      }
#ifdef DK_HAVE_SETGRENT
	      endgrent();
#endif
	      $? ". after traversing groups"
#endif
	      if(have_error) {
		uau_delete(u);
	      } else {
		(a->r).s = 0x01;
		(a->r).ec = 0;
		(a->r).u = u;
	      } $? ". detailed search (end)"
	    } else {	$? ". no detailed search necessary"
	      (a->r).s = 0x01;
	      (a->r).ec = 0;
	      (a->r).u = u;
	    }
	  } else {			$? "! memory"
	    uau_delete(u);
	  }
	} else {			$? "! memory"
	}
      } else {				$? "! no password hash"
      }
    } else {				$? "! no shadow entry"
    }
  } else {				$? "! no such user"
  } $? "- find_user %d", (int)((a->r).s)
}



/**	The system backend function.
	@param	uac	UAC structure.
	@param	bevp	Backend pointer casted to (void *).
	@param	a	API for communication between useraud and backend.
*/
void
uabesys DK_P3(UAC *,uac, void *,bevp, UAB_API *,a) {
  UAB *uab;
  uab = (UAB *)bevp;
  $? "+ uabesys %s %s %s", TR_PTR(uac), TR_PTR(uab), TR_PTR(a)
  if(a) {
    (a->r).s = 0x00;
    (a->r).ec = UA_ERROR_INTERNAL;
    (a->r).u = NULL;
    if((a->a).c == UA_API_AVAILABLE) { $? ". UA_API_AVAILABLE"
      (a->r).s = 0x01;
    } else {
      if((uac) && (uab)) {
        switch((a->a).c) {
	  case UA_API_CREATE_DATA: {	$? ". UA_API_CREATE_DATA"
	    (a->r).s = 0x01; (a->r).ec = 0;
	  } break;
	  case UA_API_DESTROY_DATA: {	$? ". UA_API_DESTROY_DATA"
	    (a->r).s = 0x01; (a->r).ec = 0;
	  } break;
	  case UA_API_CHECK_CONFIG: {	$? ". UA_API_CHECK_CONFIG"
	    (a->r).s = 0x01; (a->r).ec = 0;
	  } break;
	  case UA_API_CONFLINE: {	$? ". UA_API_CONFLINE"
	    (a->r).ec = UA_ERROR_SYNTAX; /* Nothing to configure. */
	  } break;
	  case UA_API_GET_USER: {	$? ". UA_API_GET_USER"
	    find_user(uac, uab, a);
	  } break;
	}
      }
    }
  }
  $? "- uabesys %u", (unsigned)((a->r).s)
}