OW_AIXAuthentication.cpp

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#include "OW_config.h"
#include "OW_Array.hpp"
#include "OW_String.hpp"
#include "OW_ConfigOpts.hpp"
#include "OW_AuthenticatorIFC.hpp"
#include "OW_Assertion.hpp"

#include <string.h>

#if defined(OW_AIX)
extern "C"
{
#include <usersec.h>
}
#endif /* OW_AIX */

#include "OW_Format.hpp"

namespace OW_NAMESPACE
{

class AIXAuthentication : public AuthenticatorIFC
{
private:
   virtual bool doAuthenticate(String &userName, const String &info,
      String &details, OperationContext& context);
   virtual void doInit(ServiceEnvironmentIFCRef env);  
   String m_allowedUsers;
};
// See misc_conv.c in libpam for an example.
bool AIXAuthentication::doAuthenticate(String &userName, const String &info,
   String &details, OperationContext& context)
{
   bool successful = false;
#if defined(OW_AIX)
   if (info.empty())
   {
      details = "You must authenticate to access this resource";
      return false;
   }
   Array<String> allowedUsers = m_allowedUsers.tokenize();
   bool nameFound = false;
   for (size_t i = 0; i < allowedUsers.size(); i++)
   {
      if (allowedUsers[i].equals(userName) 
                    || allowedUsers[i].equals("*"))
      {
         nameFound = true;
         break;
      }
   }
   if (!nameFound)
   {
      details = "You must authenticate to access this resource";
      return false;
   }

   // Variables used by authenticate.
   // Result is the return value (zero=success), reenter specifies if the password needs to be reentered (non-zero).
   int result, reenter;
   // FIXME! Allow variable attemps, or possibly find a way to re-request the password.
   int attempts_left = 3;
   char* message = NULL;

   char* pPasswd = strdup(info.c_str());
   char* pUserName = strdup(userName.c_str());
   // Just a test to make sure things won't go horribly wrong in the below loop.
   OW_ASSERT(pPasswd != NULL);
   OW_ASSERT(pUserName != NULL);

   do
   {
      result = ::authenticate(pUserName, pPasswd, &reenter, &message);
      --attempts_left;
   }
   while ( (attempts_left > 0) && reenter );

   free(pUserName);
   free(pPasswd);
   
   // Both should be 0 if the above loop was successful.
   if ( reenter || result )
   {
      if ( message )
      {
         details = message;
      }
      else if ( attempts_left <= 0 )
      {
         details = "Maximum authorization attempts made.";
      }
      else
      {
         details = "Unknown authentication failure.";
      }
   }
   if ( message )
   {
      free(message);
   }

   // FIXME! Potentially check to see if the password has expired, or that kind of stuff.
   
   successful = !reenter && !result;
#else
   details = "Authentication type (AIX) not supported on this platform.";
#endif /* OW_AIX */
   return successful;
}

void AIXAuthentication::doInit(ServiceEnvironmentIFCRef env)
{
   m_allowedUsers = env->getConfigItem(ConfigOpts::PAM_ALLOWED_USERS_opt);
}

} // end namespace OW_NAMESPACE

OW_AUTHENTICATOR_FACTORY(OpenWBEM::AIXAuthentication,aix);

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