/etc/psad/psad.conf

#
##############################################################################
#
# This is the configuration file for psad (the Port Scan Attack Detector).
# Normally this file gets installed at /etc/psad/psad.conf, but can be put
# anywhere in the filesystem and then the path can be specified on the
# command line argument "-c <file>" to psad. All three psad daemons (psad,
# kmsgsd, and psadwatchd) reference this config file.
#
# Each line has the form "<variable name> <value>;". Note the semi-
# colon after the <value>. All characters after the semicolon will be
# ignored to provide space for comments.
#
##############################################################################
#
# $Id: psad.conf 2297 2010-07-14 21:02:07Z mbr $
#

### Supports multiple email addresses (as a comma separated
### list).
EMAIL_ADDRESSES root@localhost;

### Machine hostname
HOSTNAME _CHANGEME_;

### Specify the home and external networks. Note that by default the
### ENABLE_INTF_LOCAL_NETS is enabled, so psad automatically detects
### all of the directly connected subnets and uses this information as
### the HOME_NET variable.
HOME_NET any;
EXTERNAL_NET any;

### The FW_SEARCH_ALL variable controls has psad will parse iptables
### messages. If it is set to "Y" then psad will parse all iptables
### messages for evidence of scan activity. If it is set to "N" then
### psad will only parse those iptables messages that contain logging
### prefixes specified by the FW_MSG_SEARCH variable below. Logging
### prefixes are set with the --log-prefix command line option to iptables.
### Setting FW_SEARCH_ALL to "N" is useful for having psad only analyze
### iptables messages that are logged out of a specific iptables chain
### (multiple strings can be searched for, see the comment above the
### FW_MSG_SEARCH variable below) or a specific logging rule for example.
### FW_SEARCH_ALL is set to "Y" by default since usually people want psad
### to parse all iptables messages.
FW_SEARCH_ALL Y;

### The FW_MSG_SEARCH variable can be modified to look for logging messages
### that are specific to your firewall configuration (specified by the
### "--log-prefix" option. For example, if your firewall uses the
### string "Audit" for packets that have been blocked, then you could
### set FW_MSG_SEARCH to "Audit"; The default string to search for is
### "DROP". Both psad and kmsgsd reference this file. NOTE: You can
### specify this variable multiple times to have psad search for multiple
### strings. For example to have psad search for the strings "Audit" and
### "Reject", you would use the following two lines:
#FW_MSG_SEARCH Audit;
#FW_MSG_SEARCH REJECT;
FW_MSG_SEARCH DROP;

### Set the type of syslog daemon that is used. The SYSLOG_DAEMON
### variable accepts four possible values: syslogd, syslog-ng, ulogd,
### or metalog.
SYSLOG_DAEMON syslogd;

### What type of interface configuration do you use? This this variable to
### "iproute2" if you want to use the iproute2 type configuration.
### iproute2 does not use aliases for multi-homed interfaces and
### ifconfig does not show secondary addresses for multi-homed interfaces.
#IFCFGTYPE iproute2;
IFCFGTYPE ifconfig;

### Danger levels. These represent the total number of
### packets required for a scan to reach each danger level.
### A scan may also reach a danger level if the scan trips
### a signature or if the scanning ip is listed in
### auto_ips so a danger level is automatically
### assigned.
DANGER_LEVEL1 5; ### Number of packets.
DANGER_LEVEL2 15;
DANGER_LEVEL3 150;
DANGER_LEVEL4 1500;
DANGER_LEVEL5 10000;

### Set the interval (in seconds) psad will use to sleep before
### checking for new iptables log messages
CHECK_INTERVAL 5;

### Search for snort "sid" values generated by fwsnort
### or snort2iptables
SNORT_SID_STR SID;

### Set the minimum range of ports that must be scanned before
### psad will send an alert. The default is 1 so that at
### least two port must be scanned (p2-p1 >= 1). This can be set
### to 0 if you want psad to be extra paranoid, or 30000 if not.
PORT_RANGE_SCAN_THRESHOLD 1;

### If "Y", means that scans will never timeout. This is useful
### for catching scans that take place over long periods of time
### where the attacker is trying to slip beneath the IDS thresholds.
ENABLE_PERSISTENCE Y;

### This is used only if ENABLE_PERSISTENCE = "N";
SCAN_TIMEOUT 3600; ### seconds

### If "Y", means all signatures will be shown since
### the scan started instead of just the current ones.
SHOW_ALL_SIGNATURES N;

### Allow reporting methods to be enabled/restricted. This keyword can
### accept values of "nosyslog" (don't write any messages to syslog),
### "noemail" (don't send any email messages), or "ALL" (to generate both
### syslog and email messages). "ALL" is the default. Both "nosyslog"
### and "noemail" can be combined with a comma to disable all logging
### and alerting.
ALERTING_METHODS ALL;

### By default, psad acquires iptables log data from the /var/log/psad/fwdata
### file which is written to by kmsgsd. However, psad can just read an
### existing file that syslog writes iptables log data to (commonly
### /var/log/messages). On some systems, having syslog communicate log data
### to kmsgsd can be problematic (syslog configs and external factors such
### as Apparmor and SELinux can play a role here), so using this feature can
### simplify a psad deployment.
ENABLE_SYSLOG_FILE Y;
IPT_WRITE_FWDATA Y;
IPT_SYSLOG_FILE /var/log/messages;

### When enabled, this instructs psad to write the "msg" field
### associated with Snort rule matches to syslog.
ENABLE_SIG_MSG_SYSLOG Y;
SIG_MSG_SYSLOG_THRESHOLD 10;
SIG_SID_SYSLOG_THRESHOLD 10;

### TTL values are decremented depending on the number of hops
### the packet has taken before it hits the firewall. We will
### assume packets will not jump through more than 20 hops on
### average.
MAX_HOPS 20;

### Do not include any timestamp included within kernel logging
### messages (Ubuntu systems commonly have this)
IGNORE_KERNEL_TIMESTAMP Y;

### FIXME: try to mitigate the affects of the iptables connection
### tracking bug by ignoring tcp packets that have the ack bit set.
### Read the "BUGS" section of the psad man page. Note that
### if a packet matches a snort SID generated by fwsnort (see
### http://www.cipherdyne.org/fwsnort/)
### then psad will see it even if the ack bit is set. See the
### SNORT_SID_STR variable.
IGNORE_CONNTRACK_BUG_PKTS Y;

### define a set of ports to ignore (this is useful particularly
### for port knocking applications since the knock sequence will
### look to psad like a scan). This variable may be defined as
### a comma-separated list of port numbers or port ranges and
### corresponding protocol, For example, to have psad ignore all
### tcp in the range 61000-61356 and udp ports 53 and 5000, use:
### IGNORE_PORTS tcp/61000-61356, udp/53, udp/5000;
IGNORE_PORTS NONE;

### allow entire protocols to be ignored. This keyword can accept
### a comma separated list of protocols. Each protocol must match
### the protocol that is specified in a Netfilter log message (case
### insensitively, so both "TCP" or "tcp" is ok).
### IGNORE_PROTOCOL tcp,udp;
IGNORE_PROTOCOLS NONE;

### allow packets to be ignored based on interface (this is the
### "IN" interface in Nefilter logging messages).
IGNORE_INTERFACES NONE;

### Ignore these specific logging prefixes
IGNORE_LOG_PREFIXES NONE;

### Minimum danger level a scan must reach before any logging or
### alerting is done. The EMAIL_ALERT_DANGER_LEVEL variable below
### only refers to email alerts; the MIN_DANGER_LEVEL variable
### applies to everything from email alerts to whether or not the
### IP directory is created within /var/log/psad/. Hence
### MIN_DANGER_LEVEL should be set less than or equal to the value
### assigned to the EMAIL_ALERT_DANGER_LEVEL variable.
MIN_DANGER_LEVEL 1;

### Only send email alert if danger level >= to this value.
EMAIL_ALERT_DANGER_LEVEL 1;

### Treat all subnets on local interfaces as part of HOME_NET (this
### means that these networks do not have to be manually defined)
ENABLE_INTF_LOCAL_NETS Y;

### Include MAC addresses in email alert
ENABLE_MAC_ADDR_REPORTING N;

### Look for the Netfilter logging rule (fwcheck_psad is executed)
ENABLE_FW_LOGGING_CHECK Y;

### Send no more than this number of emails for a single
### scanning source IP. Note that enabling this feature may cause
### alerts for real attacks to not be generated if an attack is sent
### after the email threshold has been reached for an IP address.
### This is why the default is set to "0".
EMAIL_LIMIT 0;

### By default, psad maintains a counter for each scanning source address,
### but by enabling this variable psad will maintain email counters for
### each victim address that is scanned as well.
ENABLE_EMAIL_LIMIT_PER_DST N;

### If "Y", send a status email message when an IP has reached the
### EMAIL_LIMIT threshold.
EMAIL_LIMIT_STATUS_MSG Y;

### If "Y", send email for all newly logged packets from the same
### source ip instead of just when a danger level increases.
ALERT_ALL Y;

### If "Y", then psad will import old scan source ip directories
### as current scans instead of moving the directories into the
### archive directory.
IMPORT_OLD_SCANS N;

### syslog facility and priority (the defaults are usually ok)
### The SYSLOG_FACILITY variable can be set to one of LOG_LOCAL{0-7}, and
### SYSLOG_PRIORITY can be set to one of LOG_INFO, LOG_DEBUG, LOG_NOTICE,
### LOG_WARNING, LOG_ERR, LOG_CRIT, LOG_ALERT, or LOG_EMERG
SYSLOG_IDENTITY psad;
SYSLOG_FACILITY LOG_LOCAL7;
SYSLOG_PRIORITY LOG_INFO;

### Port thresholds for logging and -S and -A output.
TOP_PORTS_LOG_THRESHOLD 500;
STATUS_PORTS_THRESHOLD 20;

### Signature thresholds for logging and -S and -A output.
TOP_SIGS_LOG_THRESHOLD 500;
STATUS_SIGS_THRESHOLD 50;

### Attackers thresholds for logging and -S and -A output.
TOP_IP_LOG_THRESHOLD 500;
STATUS_IP_THRESHOLD 25;

### Specify how often to log the TOP_* information (i.e. how many
### CHECK_INTERVAL iterations before the data is logged again).
TOP_SCANS_CTR_THRESHOLD 1;

### Send scan logs to dshield.org. This is disabled by default,
### but is a good idea to enable it (subject to your site security
### policy) since the DShield service helps to track the bad guys.
### For more information visit http://www.dshield.org
ENABLE_DSHIELD_ALERTS N;

### dshield.org alert email address; this should not be changed
### unless the guys at DShield have changed it.
DSHIELD_ALERT_EMAIL reports@dshield.org;

### Time interval (hours) to send email alerts to dshield.org.
### The default is 6 hours, and cannot be less than 1 hour or
### more than 24 hours.
DSHIELD_ALERT_INTERVAL 6; ### hours

### If you have a DShield user id you can set it here. The
### default is "0".
DSHIELD_USER_ID 0;

### If you want the outbound DShield email to appear as though it
### is coming from a particular user address then set it here.
DSHIELD_USER_EMAIL NONE;

### Threshold danger level for DShield data; a scan must reach this
### danger level before associated packets will be included in an
### alert to DShield. Note that zero is the default since this
### will allow DShield to apply its own logic to determine what
### constitutes a scan (_all_ iptables log messages will be included
### in DShield email alerts).
DSHIELD_DL_THRESHOLD 0;

### List of servers. Fwsnort supports the same variable resolution as
#### Snort.
HTTP_SERVERS $HOME_NET;
SMTP_SERVERS $HOME_NET;
DNS_SERVERS $HOME_NET;
SQL_SERVERS $HOME_NET;
TELNET_SERVERS $HOME_NET;

#### AOL AIM server nets
AIM_SERVERS [64.12.24.0/24, 64.12.25.0/24, 64.12.26.14/24, 64.12.28.0/24, 64.12.29.0/24, 64.12.161.0/24, 64.12.163.0/24, 205.188.5.0/24, 205.188.9.0/24];

### Configurable port numbers
HTTP_PORTS 80;
SHELLCODE_PORTS !80;
ORACLE_PORTS 1521;

### If this is enabled, then psad will die if a rule in the
### /etc/psad/signatures file contains an unsupported option (otherwise
### a syslog warning will be generated).
ENABLE_SNORT_SIG_STRICT Y;

### If "Y", enable automated IDS response (auto manages
### firewall rulesets).
ENABLE_AUTO_IDS N;

### Block all traffic from offending IP if danger
### level >= to this value
AUTO_IDS_DANGER_LEVEL 5;

### Set the auto-blocked timeout in seconds (the default
### is one hour).
AUTO_BLOCK_TIMEOUT 3600;

### Enable regex checking on log prefixes for active response
ENABLE_AUTO_IDS_REGEX N;

### Only block if the Netfilter log message matches the following regex
AUTO_BLOCK_REGEX ESTAB; ### from fwsnort logging prefixes

### Control whether "renew" auto-block emails get sent. This is disabled
### by default because lots of IPs could have been blocked, and psad
### should not generate a renew email for each of them.
ENABLE_RENEW_BLOCK_EMAILS N;

### By setting this variable to N, all auto-blocking emails can be
### suppressed.
ENABLE_AUTO_IDS_EMAILS Y;

### Enable iptables blocking (only gets enabled if
### ENABLE_AUTO_IDS is also set)
IPTABLES_BLOCK_METHOD Y;

### Specify chain names to which iptables blocking rules will be
### added with the IPT_AUTO_CHAIN{n} keyword. There is no limit on the
### number of IPT_AUTO_CHAIN{n} keywords; just increment the {n} number
### to add an additional IPT_AUTO_CHAIN requirement. The format for this
### variable is: <Target>,<Direction>,<Table>,<From_chain>,<Jump_rule_position>, \
### <To_chain>,<Rule_position>.
### "Target": Can be any legitimate Netfilter target, but should usually
### just be "DROP".
### "Direction": Can be "src", "dst", or "both", which correspond to the
### INPUT, OUTPUT, and FORWARD chains.
### "Table": Can be any Netfilter table, but the default is "filter".
### "From_chain": Is the chain from which packets will be jumped.
### "Jump_rule_position": Defines the position within the From_chain where
### the jump rule is added.
### "To_chain": Is the chain to which packets will be jumped. This is the
### main chain where psad rules are added.
### "Rule_position": Defines the position where rule are added within the
### To_chain.
###
### The following defaults make sense for most installations, but note
### it is possible to include blocking rules in, say, the "nat" table
### using this functionality as well. The following three lines provide
### usage examples:
#IPT_AUTO_CHAIN1 DROP, src, filter, INPUT, 1, PSAD_BLOCK_INPUT, 1;
#IPT_AUTO_CHAIN2 DROP, dst, filter, OUTPUT, 1, PSAD_BLOCK_OUTPUT, 1;
#IPT_AUTO_CHAIN3 DROP, both, filter, FORWARD, 1, PSAD_BLOCK_FORWARD, 1;
IPT_AUTO_CHAIN1 DROP, src, filter, INPUT, 1, PSAD_BLOCK_INPUT, 1;
IPT_AUTO_CHAIN2 DROP, dst, filter, OUTPUT, 1, PSAD_BLOCK_OUTPUT, 1;
IPT_AUTO_CHAIN3 DROP, both, filter, FORWARD, 1, PSAD_BLOCK_FORWARD, 1;

### Flush all existing rules in the psad chains at psad start time.
FLUSH_IPT_AT_INIT Y;

### Prerequisite check for existence of psad chains and jump rules
IPTABLES_PREREQ_CHECK 1;

### Enable tcp wrappers blocking (only gets enabled if
### ENABLE_AUTO_IDS is also set)
TCPWRAPPERS_BLOCK_METHOD N;

### Set the whois timeout
WHOIS_TIMEOUT 60; ### seconds

### Set the number of times an ip can be seen before another whois
### lookup is issued.
WHOIS_LOOKUP_THRESHOLD 20;

### Use this option to force all whois information to contain ascii-only data.
### Sometime whois information for IP addresses in China and other countries
### can contain non-ascii data. If this option is enabled, then any non-
### ascii characters will be replaced with "NA".
ENABLE_WHOIS_FORCE_ASCII N;

### This variable forces all whois lookups to be done against the source IP
### even when they are associated with a directly connected local network. IT
### is usually a good idea to leave this setting as the default of 'N'.
ENABLE_WHOIS_FORCE_SRC_IP N;

### Set the number of times an ip can be seen before another dns
### lookup is issued.
DNS_LOOKUP_THRESHOLD 20;

### Enable psad to run an external script or program (use at your
### own risk!)
ENABLE_EXT_SCRIPT_EXEC N;

### Define an external program to run after a scan is caught.
### Note that the scan source ip can be specified on the command
### line to the external program through the use of the "SRCIP"
### string (along with some appropriate switch for the program).
### Of course this is only useful if the external program knows
### what to do with this information.
### Example: EXTERNAL_SCRIPT /path/to/script --ip SRCIP -v;
EXTERNAL_SCRIPT /bin/true;

### Control execution of EXTERNAL_SCRIPT (only once per IP, or
### every time a scan is detected for an ip).
EXEC_EXT_SCRIPT_PER_ALERT N;

### Disk usage variables
DISK_CHECK_INTERVAL 300; ### seconds

### This can be set to 0 to disable disk checking altogether
DISK_MAX_PERCENTAGE 95;

### This can be set to 0 to have psad not place any limit on the
### number of times it will attempt to remove data from
### /var/log/psad/.
DISK_MAX_RM_RETRIES 10;

### Enable archiving of old scan directories at psad startup.
ENABLE_SCAN_ARCHIVE N;

### Truncate fwdata file at startup
TRUNCATE_FWDATA Y;

### Only archive scanning IP directories that have reached a danger
### level greater than or equal to this value. Archiving old
### scanning ip directories only takes place at psad startup.
MIN_ARCHIVE_DANGER_LEVEL 1;

### Email subject line config. Change these prefixes if you want
### psad to generate email alerts that say something other than
### the following.
MAIL_ALERT_PREFIX [psad-alert];
MAIL_STATUS_PREFIX [psad-status];
MAIL_ERROR_PREFIX [psad-error];
MAIL_FATAL_PREFIX [psad-fatal];

### URL for getting the latest psad signatures
SIG_UPDATE_URL http://www.cipherdyne.org/psad/signatures;

### These next two are psadwatchd vars
PSADWATCHD_CHECK_INTERVAL 5; ### seconds
PSADWATCHD_MAX_RETRIES 10;

### Directories
PSAD_DIR /var/log/psad;
PSAD_RUN_DIR /var/run/psad;
PSAD_FIFO_DIR /var/lib/psad;
PSAD_LIBS_DIR /usr/lib/psad;
PSAD_CONF_DIR /etc/psad;
PSAD_ERR_DIR $PSAD_DIR/errs;
CONF_ARCHIVE_DIR $PSAD_CONF_DIR/archive;
SCAN_DATA_ARCHIVE_DIR $PSAD_DIR/scan_archive;
ANALYSIS_MODE_DIR $PSAD_DIR/ipt_analysis;
SNORT_RULES_DIR $PSAD_CONF_DIR/snort_rules;

### Files
FW_DATA_FILE $PSAD_DIR/fwdata;
ULOG_DATA_FILE $PSAD_DIR/ulogd.log;
FW_CHECK_FILE $PSAD_DIR/fw_check;
DSHIELD_EMAIL_FILE $PSAD_DIR/dshield.email;
SIGS_FILE $PSAD_CONF_DIR/signatures;
ICMP_TYPES_FILE $PSAD_CONF_DIR/icmp_types;
AUTO_DL_FILE $PSAD_CONF_DIR/auto_dl;
SNORT_RULE_DL_FILE $PSAD_CONF_DIR/snort_rule_dl;
POSF_FILE $PSAD_CONF_DIR/posf;
P0F_FILE $PSAD_CONF_DIR/pf.os;
IP_OPTS_FILE $PSAD_CONF_DIR/ip_options;
PSAD_FIFO_FILE $PSAD_FIFO_DIR/psadfifo;
ETC_HOSTS_DENY_FILE /etc/hosts.deny;
ETC_SYSLOG_CONF /etc/syslog.conf;
ETC_RSYSLOG_CONF /etc/rsyslog.conf;
ETC_SYSLOGNG_CONF /etc/syslog-ng/syslog-ng.conf;
ETC_METALOG_CONF /etc/metalog/metalog.conf;
STATUS_OUTPUT_FILE $PSAD_DIR/status.out;
ANALYSIS_OUTPUT_FILE $PSAD_DIR/analysis.out;
INSTALL_LOG_FILE $PSAD_DIR/install.log;

### PID files
PSAD_PID_FILE $PSAD_RUN_DIR/psad.pid;
PSAD_CMDLINE_FILE $PSAD_RUN_DIR/psad.cmd;
KMSGSD_PID_FILE $PSAD_RUN_DIR/kmsgsd.pid;
PSADWATCHD_PID_FILE $PSAD_RUN_DIR/psadwatchd.pid;

### List of ips that have been auto blocked by iptables
### or tcpwrappers (the auto blocking feature is disabled by
### default, see the psad man page and the ENABLE_AUTO_IDS
### variable).
AUTO_BLOCK_IPT_FILE $PSAD_DIR/auto_blocked_iptables;
AUTO_BLOCK_TCPWR_FILE $PSAD_DIR/auto_blocked_tcpwr;

### File used internally by psad to add Netfilter blocking
### rules to a running psad process
AUTO_IPT_SOCK $PSAD_RUN_DIR/auto_ipt.sock;

FW_ERROR_LOG $PSAD_ERR_DIR/fwerrorlog;
PRINT_SCAN_HASH $PSAD_DIR/scan_hash;

### /proc interface for controlling ip forwarding
PROC_FORWARD_FILE /proc/sys/net/ipv4/ip_forward;

### Packet counters for tcp, udp, and icmp protocols
PACKET_COUNTER_FILE $PSAD_DIR/packet_ctr;

### Top scanned ports
TOP_SCANNED_PORTS_FILE $PSAD_DIR/top_ports;

### Top signature matches
TOP_SIGS_FILE $PSAD_DIR/top_sigs;

### Top attackers
TOP_ATTACKERS_FILE $PSAD_DIR/top_attackers;

### Counter file for Dshield alerts
DSHIELD_COUNTER_FILE $PSAD_DIR/dshield_ctr;

### Counter file for iptables prefixes
IPT_PREFIX_COUNTER_FILE $PSAD_DIR/ipt_prefix_ctr;

### iptables command output and error collection files; these are
### used by IPTables::ChainMgr
IPT_OUTPUT_FILE $PSAD_DIR/psad.iptout;
IPT_ERROR_FILE $PSAD_DIR/psad.ipterr;

### system binaries
iptablesCmd /sbin/iptables;
shCmd /bin/sh;
wgetCmd /usr/bin/wget;
gzipCmd /bin/gzip;
mknodCmd /bin/mknod;
psCmd /bin/ps;
mailCmd /bin/mail;
sendmailCmd /usr/sbin/sendmail;
ifconfigCmd /sbin/ifconfig;
ipCmd /sbin/ip;
killallCmd /usr/bin/killall;
netstatCmd /bin/netstat;
unameCmd /bin/uname;
whoisCmd /usr/bin/whois_psad;
dfCmd /bin/df;
fwcheck_psadCmd /usr/sbin/fwcheck_psad;
psadwatchdCmd /usr/sbin/psadwatchd;
kmsgsdCmd /usr/sbin/kmsgsd;
psadCmd /usr/sbin/psad;

psad 2.1.7-1 / etc / psad / psad.conf