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/* 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];
struct sigaction sa;
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 */
sigfillset (&sa.sa_mask);
sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
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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