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/************************************************************************/
/* */
/* PortSentry */
/* */
/* Created: 10-12-1997 */
/* Modified: 05-23-2003 */
/* */
/* Send all changes/modifications/bugfixes to: */
/* craigrowland at users dot sourceforge dot net */
/* */
/* */
/* This software is Copyright(c) 1997-2003 Craig Rowland */
/* */
/* This software is covered under the Common Public License v1.0 */
/* See the enclosed LICENSE file for more information. */
/* $Id: portsentry_io.c,v 1.36 2003/05/23 17:41:40 crowland Exp crowland $ */
/************************************************************************/
#include "portsentry.h"
#include "portsentry_io.h"
#include "portsentry_util.h"
/* Main logging function to surrogate syslog */
void
Log (char *logentry, ...)
{
char logbuffer[MAXBUF];
va_list argsPtr;
va_start (argsPtr, logentry);
vsnprintf (logbuffer, MAXBUF, logentry, argsPtr);
va_end(argsPtr);
openlog ("portsentry", LOG_PID, SYSLOG_FACILITY);
syslog (SYSLOG_LEVEL, "%s", logbuffer);
closelog ();
}
void
Exit (int status)
{
Log ("securityalert: PortSentry is shutting down\n");
Log ("adminalert: PortSentry is shutting down\n");
exit (status);
}
void
Start (void)
{
Log ("adminalert: PortSentry %s is starting.\n", VERSION);
#ifdef DEBUG
printf("Compiled: " __DATE__ " at " __TIME__ "\n");
#endif
}
/* The daemonizing code copied from Advanced Programming */
/* in the UNIX Environment by W. Richard Stevens with minor changes */
int
DaemonSeed (void)
{
int childpid;
signal (SIGALRM, SIG_IGN);
signal (SIGHUP, SIG_IGN);
signal (SIGPIPE, SIG_IGN);
signal (SIGTERM, Exit);
signal (SIGABRT, Exit);
signal (SIGURG, Exit);
signal (SIGKILL, Exit);
if ((childpid = fork ()) < 0)
return (ERROR);
else if (childpid > 0)
exit (0);
setsid ();
chdir ("/");
umask (077);
/* close stdout, stdin, stderr */
close(0);
close(1);
close(2);
return (TRUE);
}
/* Compares an IP address against a listed address and its netmask*/
int
CompareIPs(char *target, char *ignoreAddr, int ignoreNetmaskBits)
{
unsigned long int netmaskAddr, ipAddr, targetAddr;
ipAddr = inet_addr(ignoreAddr);
targetAddr = inet_addr(target);
netmaskAddr = htonl (0xFFFFFFFF << (32 - ignoreNetmaskBits));
#ifdef DEBUG
Log ("debug: target %s\n", target);
Log ("debug: ignoreAddr %s\n", ignoreAddr);
Log ("debug: ignoreNetmaskBits %d\n", ignoreNetmaskBits);
Log ("debug: ipAddr %lu\n", ipAddr);
Log ("debug: targetAddr %lu\n", targetAddr);
Log ("debug: netmask %x\n", netmaskAddr);
Log ("debug: mix ipAddr %lu\n", (ipAddr & netmaskAddr));
Log ("debug: mix target %lu\n", (targetAddr & netmaskAddr));
#endif
/* Network portion mask & op and return */
if ((ipAddr & netmaskAddr) == (targetAddr & netmaskAddr))
return(TRUE);
else
return(FALSE);
}
/* check hosts that should never be blocked */
int
NeverBlock (char *target, char *filename)
{
FILE *input;
char buffer[MAXBUF], tempBuffer[MAXBUF], netmaskBuffer[MAXBUF];
char *slashPos;
int count = 0, dest = 0, netmaskBits = 0;
#ifdef DEBUG
Log ("debug: NeverBlock: Opening ignore file: %s \n", filename);
#endif
if ((input = fopen (filename, "r")) == NULL)
return (ERROR);
#ifdef DEBUG
Log ("debug: NeverBlock: Doing lookup for host: %s \n", target);
#endif
while (fgets (buffer, MAXBUF, input) != NULL)
{
/* Reset destination counter */
dest = 0;
if ((buffer[0] == '#') || (buffer[0] == '\n'))
continue;
for(count = 0; count < strlen(buffer); count++)
{
/* Parse out digits, colons, and slashes. Everything else rejected */
if((isdigit(buffer[count])) ||
(buffer[count] == '.') || (buffer[count] == ':') || (buffer[count] == '/'))
{
tempBuffer[dest++] = buffer[count];
}
else
{
tempBuffer[dest] = '\0';
break;
}
}
/* Return pointer to slash if it exists and copy data to buffer */
slashPos = strchr(tempBuffer, '/');
if (slashPos)
{
SafeStrncpy(netmaskBuffer, slashPos + 1, MAXBUF);
/* Terminate tempBuffer string at delimeter for later use */
*slashPos = '\0';
}
else
/* Copy in a 32 bit netmask if none given */
SafeStrncpy(netmaskBuffer, "32", MAXBUF);
/* Convert netmaskBuffer to bits in netmask */
netmaskBits = atoi(netmaskBuffer);
if ((netmaskBits < 0) || (netmaskBits > 32))
{
Log ("adminalert: Invalid netmask in config file: %s Ignoring entry.\n", buffer);
continue;
}
if (CompareIPs(target, tempBuffer, netmaskBits))
{
#ifdef DEBUG
Log ("debug: NeverBlock: Host: %s found in ignore file with netmask %s\n", target, netmaskBuffer);
#endif
fclose (input);
return (TRUE);
}
} /* end while() */
#ifdef DEBUG
Log ("debug: NeverBlock: Host: %s NOT found in ignore file\n", target);
#endif
fclose (input);
return (FALSE);
}
/* Make sure the config file is available */
int
CheckConfig (void)
{
FILE *input;
if ((input = fopen (CONFIG_FILE, "r")) == NULL)
{
Log ("adminalert: Cannot open config file: %s. Exiting\n", CONFIG_FILE);
return(FALSE);
}
else
fclose (input);
return(TRUE);
}
/* This writes out blocked hosts to the blocked file. It adds the hostname */
/* time stamp, and port connection that was acted on */
int
WriteBlocked (char *target, char *resolvedHost, int port, char *blockedFilename,
char *historyFilename, char *portType)
{
FILE *output;
int blockedStatus = TRUE, historyStatus = TRUE;
struct tm *tmptr;
time_t current_time;
current_time = time (0);
tmptr = localtime (¤t_time);
#ifdef DEBUG
Log ("debug: WriteBlocked: Opening block file: %s \n", blockedFilename);
#endif
if ((output = fopen (blockedFilename, "a")) == NULL)
{
Log ("adminalert: ERROR: Cannot open blocked file: %s.\n", blockedFilename);
blockedStatus = FALSE;
}
else
{
fprintf (output, "%ld - %02d/%02d/%04d %02d:%02d:%02d Host: %s/%s Port: %d %s Blocked\n",
current_time, tmptr->tm_mon + 1, tmptr->tm_mday, tmptr->tm_year + 1900,
tmptr->tm_hour, tmptr->tm_min, tmptr->tm_sec, resolvedHost, target, port,
portType);
fclose (output);
blockedStatus = TRUE;
}
#ifdef DEBUG
Log ("debug: WriteBlocked: Opening history file: %s \n", historyFilename);
#endif
if ((output = fopen (historyFilename, "a")) == NULL)
{
Log ("adminalert: ERROR: Cannot open history file: %s.\n", historyFilename);
historyStatus = FALSE;
}
else
{
fprintf (output, "%ld - %02d/%02d/%04d %02d:%02d:%02d Host: %s/%s Port: %d %s Blocked\n",
current_time, tmptr->tm_mon + 1, tmptr->tm_mday, tmptr->tm_year + 1900,
tmptr->tm_hour, tmptr->tm_min, tmptr->tm_sec, resolvedHost, target, port,
portType);
fclose (output);
historyStatus = TRUE;
}
if (historyStatus || blockedStatus == FALSE)
return (FALSE);
else
return (TRUE);
}
/* This reads a token from the config file up to the "=" and returns the string */
/* up to the first space or NULL */
int
ConfigTokenRetrieve (char *token, char *configToken)
{
FILE *config;
char buffer[MAXBUF], tokenBuffer[MAXBUF];
int count = 0;
if ((config = fopen (CONFIG_FILE, "r")) == NULL)
{
Log ("adminalert: ERROR: Cannot open config file: %s.\n", CONFIG_FILE);
return (ERROR);
}
else
{
#ifdef DEBUG
Log ("debug: ConfigTokenRetrieve: checking for token %s", token);
#endif
while ((fgets (buffer, MAXBUF, config)) != NULL)
{
/* this skips comments */
if (buffer[0] != '#')
{
#ifdef DEBUG
Log ("debug: ConfigTokenRetrieve: data: %s", buffer);
#endif
/* search for the token and make sure the trailing character */
/* is a " " or "=" to make sure the entire token was found */
if ((strstr (buffer, token) != (char) NULL) &&
((buffer[strlen(token)] == '=') || (buffer[strlen(token)] == ' ')))
{ /* cut off the '=' and send it back */
if (strstr (buffer, "\"") == (char) NULL)
{
Log ("adminalert: Quotes missing from %s token. Option skipped\n", token);
fclose (config);
return (FALSE);
}
SafeStrncpy (tokenBuffer, strstr (buffer, "\"") + 1, MAXBUF);
/* strip off unprintables/linefeeds (if any) */
count = 0;
while (count < MAXBUF - 1)
{
if ((isprint (tokenBuffer[count])) && tokenBuffer[count] != '"')
configToken[count] = tokenBuffer[count];
else
{
configToken[count] = '\0';
break;
}
count++;
}
#ifdef DEBUG
Log ("debug: ConfigTokenRetrieved token: %s\n", configToken);
#endif
configToken[MAXBUF - 1] = '\0';
fclose (config);
return (TRUE);
}
}
}
fclose (config);
return (FALSE);
}
}
/* This will bind a socket to a port. It works for UDP/TCP */
int
BindSocket (int sockfd, struct sockaddr_in client,
struct sockaddr_in server, int port)
{
#ifdef DEBUG
Log ("debug: BindSocket: Binding to port: %d\n", port);
#endif
bzero ((char *) &server, sizeof (server));
server.sin_family = AF_INET;
server.sin_addr.s_addr = htonl (INADDR_ANY);
server.sin_port = htons (port);
if (bind (sockfd, (struct sockaddr *) &server, sizeof (server)) < 0)
{
#ifdef DEBUG
Log ("debug: BindSocket: Binding failed\n");
#endif
return (ERROR);
}
else
{
#ifdef DEBUG
Log ("debug: BindSocket: Binding successful. Doing listen\n");
#endif
listen (sockfd, 5);
return (TRUE);
}
}
/* Open a TCP Socket */
int
OpenTCPSocket (void)
{
int sockfd;
#ifdef DEBUG
Log ("debug: OpenTCPSocket: opening TCP socket\n");
#endif
if ((sockfd = socket (AF_INET, SOCK_STREAM, 0)) < 0)
return (ERROR);
else
return (sockfd);
}
/* Open a UDP Socket */
int
OpenUDPSocket (void)
{
int sockfd;
#ifdef DEBUG
Log ("debug: openUDPSocket opening UDP socket\n");
#endif
if ((sockfd = socket (AF_INET, SOCK_DGRAM, 0)) < 0)
return (ERROR);
else
return (sockfd);
}
#ifdef SUPPORT_STEALTH
/* Open a RAW TCPSocket */
int
OpenRAWTCPSocket (void)
{
int sockfd;
#ifdef DEBUG
Log ("debug: OpenRAWTCPSocket: opening RAW TCP socket\n");
#endif
if ((sockfd = socket (AF_INET, SOCK_RAW, IPPROTO_TCP)) < 0)
return (ERROR);
else
return (sockfd);
}
/* Open a RAW UDP Socket */
int
OpenRAWUDPSocket (void)
{
int sockfd;
#ifdef DEBUG
Log ("debug: OpenRAWUDPSocket: opening RAW UDP socket\n");
#endif
if ((sockfd = socket (AF_INET, SOCK_RAW, IPPROTO_UDP)) < 0)
return (ERROR);
else
return (sockfd);
}
#endif
/* This will use a system() call to change the route of the target host to */
/* a dead IP address on your LOCAL SUBNET. */
int
KillRoute (char *target, int port, char *killString, char *detectionType)
{
char cleanAddr[MAXBUF], commandStringTemp[MAXBUF];
char commandStringTemp2[MAXBUF],commandStringFinal[MAXBUF];
char portString[MAXBUF];
int killStatus = ERROR, substStatus = ERROR;
CleanIpAddr (cleanAddr, target);
snprintf(portString, MAXBUF, "%d", port);
substStatus = SubstString (cleanAddr, "$TARGET$", killString, commandStringTemp);
if (substStatus == 0)
{
Log ("adminalert: No target variable specified in KILL_ROUTE option. Skipping.\n");
return (ERROR);
}
else if (substStatus == ERROR)
{
Log ("adminalert: Error trying to parse $TARGET$ Token for KILL_ROUTE. Skipping.\n");
return (ERROR);
}
if(SubstString (portString, "$PORT$", commandStringTemp, commandStringTemp2) == ERROR)
{
Log ("adminalert: Error trying to parse $PORT$ Token for KILL_ROUTE. Skipping.\n");
return (ERROR);
}
if(SubstString (detectionType, "$MODE$", commandStringTemp2, commandStringFinal) == ERROR)
{
Log ("adminalert: Error trying to parse $MODE$ Token for KILL_ROUTE. Skipping.\n");
return (ERROR);
}
#ifdef DEBUG
Log ("debug: KillRoute: running route command: %s\n", commandStringFinal);
#endif
/* Kill the bastard and report a status */
killStatus = system (commandStringFinal);
if (killStatus == 127)
{
Log ("adminalert: ERROR: There was an error trying to block host (exec fail) %s", target);
return (ERROR);
}
else if (killStatus < 0)
{
Log ("adminalert: ERROR: There was an error trying to block host (system fail) %s", target);
return (ERROR);
}
else
{
Log ("attackalert: Host %s has been blocked via dropped route using command: \"%s\"", target,
commandStringFinal);
return (TRUE);
}
}
/* This will run a specified command with TARGET as the option if one is given. */
int
KillRunCmd (char *target, int port, char *killString, char *detectionType)
{
char cleanAddr[MAXBUF], commandStringTemp[MAXBUF];
char commandStringTemp2[MAXBUF], commandStringFinal[MAXBUF];
char portString[MAXBUF];
int killStatus = ERROR;
CleanIpAddr (cleanAddr, target);
snprintf(portString, MAXBUF, "%d", port);
/* Tokens are not required, but we check for an error anyway */
if(SubstString (cleanAddr, "$TARGET$", killString, commandStringTemp) == ERROR)
{
Log ("adminalert: Error trying to parse $TARGET$ Token for KILL_RUN_CMD. Skipping.\n");
return (ERROR);
}
if(SubstString (portString, "$PORT$", commandStringTemp, commandStringTemp2) == ERROR)
{
Log ("adminalert: Error trying to parse $PORT$ Token for KILL_RUN_CMD. Skipping.\n");
return (ERROR);
}
if(SubstString (detectionType, "$MODE$", commandStringTemp2, commandStringFinal) == ERROR)
{
Log ("adminalert: Error trying to parse $MODE$ Token for KILL_RUN_CMD. Skipping.\n");
return (ERROR);
}
/* Kill the bastard and report a status */
killStatus = system (commandStringFinal);
if (killStatus == 127)
{
Log ("adminalert: ERROR: There was an error trying to run command (exec fail) %s", target);
return (ERROR);
}
else if (killStatus < 0)
{
Log ("adminalert: ERROR: There was an error trying to run command (system fail) %s", target);
return (ERROR);
}
else
{
/* report success */
Log ("attackalert: External command run for host: %s using command: \"%s\"", target,
commandStringFinal);
return (TRUE);
}
}
/* this function will drop the host into the TCP wrappers hosts.deny file to deny */
/* all access. The drop route metod is preferred as this stops UDP attacks as well */
/* as TCP. You may find though that host.deny will be a more permanent home.. */
int
KillHostsDeny (char *target, int port, char *killString, char *detectionType)
{
FILE *output;
char cleanAddr[MAXBUF], commandStringTemp[MAXBUF];
char commandStringTemp2[MAXBUF], commandStringFinal[MAXBUF];
char portString[MAXBUF];
int substStatus = ERROR;
CleanIpAddr (cleanAddr, target);
snprintf(portString, MAXBUF, "%d", port);
#ifdef DEBUG
Log ("debug: KillHostsDeny: parsing string for block: %s\n", killString);
#endif
substStatus = SubstString (cleanAddr, "$TARGET$", killString, commandStringTemp);
if (substStatus == 0)
{
Log ("adminalert: No target variable specified in KILL_HOSTS_DENY option. Skipping.\n");
return (ERROR);
}
else if (substStatus == ERROR)
{
Log ("adminalert: Error trying to parse $TARGET$ Token for KILL_HOSTS_DENY. Skipping.\n");
return (ERROR);
}
if(SubstString (portString, "$PORT$", commandStringTemp, commandStringTemp2) == ERROR)
{
Log ("adminalert: Error trying to parse $PORT$ Token for KILL_HOSTS_DENY. Skipping.\n");
return (ERROR);
}
if(SubstString (detectionType, "$MODE$", commandStringTemp2, commandStringFinal) == ERROR)
{
Log ("adminalert: Error trying to parse $MODE$ Token for KILL_HOSTS_DENY. Skipping.\n");
return (ERROR);
}
#ifdef DEBUG
Log ("debug: KillHostsDeny: result string for block: %s\n", commandStringFinal);
#endif
if ((output = fopen (WRAPPER_HOSTS_DENY, "a")) == NULL)
{
Log ("adminalert: cannot open hosts.deny file: %s for blocking.", WRAPPER_HOSTS_DENY);
Log ("securityalert: ERROR: There was an error trying to block host %s", target);
return (FALSE);
}
else
{
fprintf (output, "%s\n", commandStringFinal);
fclose (output);
Log ("attackalert: Host %s has been blocked via wrappers with string: \"%s\"", target, commandStringFinal);
return (TRUE);
}
}
/* check if the host is already blocked */
int
IsBlocked (char *target, char *filename)
{
FILE *input;
char buffer[MAXBUF], tempBuffer[MAXBUF];
char *ipOffset;
int count;
#ifdef DEBUG
Log ("debug: IsBlocked: Opening block file: %s \n", filename);
#endif
if ((input = fopen (filename, "r")) == NULL)
{
Log ("adminalert: ERROR: Cannot open blocked file: %s for reading. Will create.\n", filename);
return (FALSE);
}
while (fgets (buffer, MAXBUF, input) != NULL)
{
if((ipOffset = strstr(buffer, target)) != (char) NULL)
{
for(count = 0; count < strlen(ipOffset); count++)
{
if((isdigit(ipOffset[count])) ||
(ipOffset[count] == '.'))
{
tempBuffer[count] = ipOffset[count];
}
else
{
tempBuffer[count] = '\0';
break;
}
}
if(strcmp(target, tempBuffer) == 0)
{
#ifdef DEBUG
Log ("debug: isBlocked: Host: %s found in blocked file\n", target);
#endif
fclose (input);
return (TRUE);
}
}
}
#ifdef DEBUG
Log ("debug: IsBlocked: Host: %s NOT found in blocked file\n", target);
#endif
fclose(input);
return (FALSE);
}
/*********************************************************************************
* String substitute function
*
* This function takes:
*
* 1) A token to use for replacement.
* 2) A token to find.
* 3) A string with the tokens in it.
* 4) A string to write the replaced result.
*
* It returns the number of substitutions made during the operation.
**********************************************************************************/
int SubstString (const char *replace, const char *find, const char *target, char *result)
{
int replaceCount = 0, count = 0, findCount = 0, findLen=0, numberOfSubst=0;
char tempString[MAXBUF], *tempStringPtr;
#ifdef DEBUG
Log ("debug: SubstString: Processing string: %s %d", target, strlen(target));
Log ("debug: SubstString: Processing search text: %s %d", replace, strlen(replace));
Log ("debug: SubstString: Processing replace text: %s %d", find, strlen(find));
#endif
/* string not found in target */
if (strstr (target, find) == (char) NULL)
{
strncpy(result, target, MAXBUF);
#ifdef DEBUG
Log ("debug: SubstString: Result string: %s", result);
#endif
return (numberOfSubst);
}
/* String/victim/target too long */
else if ((strlen (target)) + (strlen(replace)) + (strlen(find)) > MAXBUF)
return (ERROR);
memset(tempString, '\0', MAXBUF);
memset(result, '\0', MAXBUF);
findLen = strlen(find);
tempStringPtr = tempString;
for(count = 0; count < MAXBUF; count++)
{
if(*target == '\0')
break;
else if((strncmp(target, find, findLen)) != 0)
*tempStringPtr++ = *target++;
else
{
numberOfSubst++;
for(replaceCount = 0; replaceCount < strlen(replace); replaceCount++)
*tempStringPtr++ = replace[replaceCount];
for(findCount = 0; findCount < findLen; findCount++)
target++;
}
}
strncpy(result, tempString, MAXBUF);
#ifdef DEBUG
Log ("debug: SubstString: Result string: %s", result);
#endif
return(numberOfSubst);
}
/* This function checks a config variable for a numerical flag and returns it */
int
CheckFlag (char *flagName)
{
char configToken[MAXBUF];
if ((ConfigTokenRetrieve (flagName, configToken)) == TRUE)
{
#ifdef DEBUG
Log ("debug: CheckFlag: found %s string.\n", flagName);
#endif
return (atoi(configToken));
}
else
{
#ifdef DEBUG
Log ("debug: CheckFlag: %s option not found. Assuming FALSE.\n", flagName);
#endif
return (FALSE);
}
}
/* snprintf for NEXTSTEP (others??) */
/* I don't know where this code came from and I don't */
/* warrant its effectiveness. CHR */
#ifdef HAS_NO_SNPRINTF
int
snprintf (char *str, size_t n, char const *fmt,...)
{
va_list ap;
FILE f;
if (n > MAXBUF)
{
n = MAXBUF;
}
va_start (ap, fmt);
f._file = EOF;
f._flag = _IOWRT | _IOSTRG;
f._base = f._ptr = str;
f._bufsiz = f._cnt = n ? n - 1 : 0;
(void) vfprintf (&f, fmt, ap);
va_end (ap);
if (n)
{
*f._ptr = '\0';
}
return (f._ptr - str);
}
#endif
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