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auditd-sendmail.c

/* auditd-sendmail.c --
 * Copyright 2005 Red Hat Inc., Durham, North Carolina.
 * All Rights Reserved.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Authors:
 *   Steve Grubb <sgrubb@redhat.com>
 *
 */

#include "config.h"
#include <stdio.h>
#include <unistd.h>           // for access()
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include "libaudit.h"
#include "private.h"
#include "auditd-config.h"

extern const char *email_command;
static int safe_popen(pid_t *pid, const char *mail_acct);

// returns 1 on error & 0 if OK
int sendmail(const char *subject, const char *content, const char *mail_acct)
{
      pid_t pid;

      if (access(email_command, 01) == 0)
      {     
            FILE *mail;
            int fd;

            fd = safe_popen(&pid, mail_acct);
            if (fd < 0) 
                  return 1;
            mail = fdopen(fd, "w");
            if (mail == NULL) {
                  kill(pid, SIGKILL);
                  close(fd);
                  audit_msg(LOG_ERR, "Error - starting mail"); 
                  return 1;
            }

            fprintf(mail, "To: %s\n", mail_acct);
            fprintf(mail, "From: root\n");
//          fprintf(mail, "X-Sender: %s\n", mail_acct);
            fprintf(mail, "Subject: %s\n\n", subject); // End of Header
            fprintf(mail, "%s\n", content);
            fprintf(mail, ".\n\n");       // Close it up...
            fclose(mail);
            return 0;
      } else
            audit_msg(LOG_ERR, "Error - %s isn't executable",
                  email_command); 
      return 1;   
}

static int safe_popen(pid_t *pid, const char *mail_acct)
{
      char *argv[4];
      char acct[256];
      int pipe_fd[2];

      if (pipe(pipe_fd)) {
            audit_msg(LOG_ALERT,
            "Audit daemon failed to create pipe while sending email alert");
            return -1;
      }

      *pid = fork();
      if (*pid < 0) {
            close(pipe_fd[0]);
            close(pipe_fd[1]);
            audit_msg(LOG_ALERT,
                "Audit daemon failed to fork while sending email alert");
            return -1;
      }
      if (*pid) {       /* Parent */
            close(pipe_fd[0]);      // adjust pipe
            return pipe_fd[1];
      }
      /* Child */
      close(pipe_fd[1]);      // adjust pipe
      dup2(pipe_fd[0], 0);

      /* Make email acct param */
      snprintf(acct, sizeof(acct), "-f%s", mail_acct);

      /* Stuff arg list */
      argv[0] = (char *)email_command;
      argv[1] = (char *)"-t";
      argv[2] = acct;
      argv[3] = NULL;
      execve(email_command, argv, NULL);
      audit_msg(LOG_ALERT, "Audit daemon failed to exec %s", email_command);
      exit(1);
}


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