Properly configuring Sendmail can be a real pain. Especially when all you need is to simply get email off of a system and send to remote email addresses. For this, SSMTP may be the solution. For my setup I simply want to send email from my system through Gmail.

SSMTP can be downloaded from here:

http://ftp.debian.org/debian/pool/main/s/ssmtp/ssmtp_2.62.orig.tar.gz

or using yum in to install SSMTP:

yum install ssmtp


The configuration file is /etc/ssmtp/ssmtp.conf

root=[email protected]
mailhub=smtp.gmail.com:587
rewriteDomain=
hostname=smtp.gmail.com:587
UseSTARTTLS=YES
AuthUser=gmailusername
AuthPass=gmailpassword
FromLineOverride=YES


Replace AuthUser and AuthPass with your Google Gmail username and password. The username should not have @gmail appended. Also change root=[email protected] to be the email address which should originate the email.

To make things easier I also setup a separate gmail account which just handles my outbound email from the system. If you use the same gmail account to send and then view the received email; it will never appear in the inbox.

The easiest solution is to create a separate gmail account to originate the email.

Personally, I am using SSMTP to send voicemail messages attached to an email from the Asterisk VoIP System. All I had to change in the Asterisk voicemail.conf file was the following:

;mailcmd=/usr/sbin/sendmail -t

mailcmd=ssmtp -t


My voicemail is then attached to an email as a wave file.

I have found the following nettop commands useful in my troubleshooting of IPv6 connections

nettop -n -m route

nettop -n
It is possible to get quite a speed boost out of Mail.app by stripping all the bloat out of its Envelope index.  Since mail.app uses sqlite we can use the vacuum command.   The below command works in OS X Lion:

sqlite3 ~/Library/Mail/V2/MailData/Envelope\ Index vacuum;

To monitor file writes and reads to and from the disk.   The activity will be recorded in the output.txt file.  Use control-C to quit.

sudo fs_usage -e -w > ~/output.txt


To Create a DMG from a folder:

hdiutil create name.dmg -srcfolder ~/Desktop/FolderName


To restart the OS X dock:

Restart Dock or killall Dock


You may notice if you use network shares that OS X leaves .DSShare files on the network shares. While these aren’t visable to OS X users, if you have other users accessing the same share they will see these files in every directory. Since these files simply save the appearance of the folder in OS X, disabling it shouldn’t have any adverse effect:

defaults write com.apple.desktopservices DSDontWriteNetworkStores true


In order to eject a stuck CD/DVD you can use the below command. Sometimes the CD remains in the tray but a desktop icon is no longer visable. This command line eject command will eject the CD.

  drutil tray eject

  drutil tray open

To reset a login password, start OS X with command+S which will start the system in single user mode. Then type:

fsck -fy mount -uw / launchctl load \
/System/Library/LaunchDaemons/com.apple.DirectoryServices.plist \
dscl . -passwd /Users/UserName newpassword


To convert a DMG file to an ISO File:

hdiutil convert /path/to/filename.dmg -format UDTO -o /path/to/savefile.iso


List open TCP/UDP ports:

netstat -lnp TCP
netstat -lnp UDP
lsof -i -P


List contents of DMG/PKG files:

lsbom .pkg/Contents/Archive.com> |more

nmap --spoof-mac Apple --traceroute --data-length 9 \ 
-f -D 192.168.200.200,RND:5,ME -v \
-n -O -sS -sV -oA /home/pentest/192.168.1.1 \
--log-errors -append-output \
-p T:1-1024,1433,2222,2249,7778,8080,9999 \  
--randomize-hosts 192.168.1.1 192.168.1.2 <target>


Output traceroute

--trace-route

Append random data to sent packets for IDS evasion

--data-length <num>

fragment packets into 8 byte segments for IDS evasion


-f

Stealth SYN Scan

-sS

Decoy IP Address.  Uses these addresses to scan the target

-D

Chooses 5 other random ip addresses and also generates scans from these

RND:5

Place my scan at the 6 position after the 5 random which increases
the probability that I won't be logged

,ME


No DNS resolution

-n


OS Detection

-O


Change MAC address for scans

--spoof-mac


TCP scan only

-p ports :T


randomize the targets if there are more than 1

--randomize-hosts   


The above will output 3 files.   One of the files will be an XML file.

Traditionally installing and uploading images on Cisco router has been done with TFTP.    As the IOS images have grown larger and larger some TFTP servers have problems with supporting these large file sizes.    Secure Copy - scp can be used in place of TFTP to interact with the IOS file system.    This eliminates many of the problems related to TFTP with the added benefit of security.   Below is an IOS config snippet for making this work:
 

! AAA authentication and authorization must be configured properly for SCP to work.
aaa new-model
aaa authentication login default local
aaa authorization exec default local
! Set your login credentials as appropriate
username user privilege 15 password 0 securepass
! SSH must be configured and functioning properly.
ip ssh time-out 120
ip ssh authentication-retries 3
ip scp server enable


At this point you can use any scp client to interact with the IOS filesystem.    So for example on a Unix-like filesystem:


scp -2 ./c2800nm-adventerprisek9-mz.151-2.T1.bin \
[email protected]:/c2800nm-adventerprisek9-mz.151-2.T1.bin


The above will copy the image to the flash filesystem on router 10.1.1.1.    The -2 option forces SCP to use version #2

I turned up a 6over4 tunnel to Hurricane Electric with the IPv6 traffic from the tunnel passing through a Cisco ASA firewall.   The stability and performance of the HE tunnel have been fantastic.   Here is how it is setup:

While the Cisco ASA doesn’t support direct termination of IPv6 tunnels, it does have very rich support for IPv6 firewalling.   The approach would be to take another external router which would sit outside of the ASA firewall and use that for tunnel termination.    From there, bring the IPv6 inside interface of the router terminating the tunnel and connect that to an ASA interface which only has an IPv6 address.

You will need at least one additional static IP address on your outside network in order for this to work.    Many Cable ISPs will offer this if you sign up for business level services usually for a nominal additional fee.  It may still work with a dynamic address if it doesn't change all that much.

When you signup with HE they will provide two /64 networks and a /48.   The first /64 IPv6 network is for the actual tunnel going from your external tunnel router to the HE tunnel server.   The second /64 is for the connection between the inside interface of your tunnel router and the ASA.  The final /48 is for internal subnets behind the ASA firewall.

As far as software goes, the ASA should be running software 8.2 or higher while the external IOS router could be running a recent image of 12.4T or Release 15.   In my case I am using an 1800 series router running release 15.1.3T Advanced Enterprise.

Cisco ASA Firewall Configuration:

interface Vlan6 description ipv6 to HE Tunnel
nameif ipv6-tunnel
security-level 25
no ip address
ipv6 address 2001:DB8:2222::1/64

interface Vlan1 description Internal Protected
nameif inside
security-level 100
ip address 192.168.100.1 255.255.255.0
ipv6 address 2001:DB8:F1F1::1/64
ipv6 enable
ipv6 nd prefix 2001:DB8:F1F1::/64 43200 43200

!!! The above /64 is taken from the /48 network assigned to you by HE

interface Vlan2 description IPv4
Internet nameif outside
security-level 0
ip address 50.50.50.60 255.255.255.248

route outside 0.0.0.0 0.0.0.0 50.50.50.57
ipv6 route ipv6-tunnel ::/0 2001:DB8:2222::2

Outside Tunnel Router IOS Configuration:

ipv6 unicast-routing

ipv6 cef

interface Tunnel0
description Hurricane Electric IPv6 Tunnel Broker
no ip address
ip flow ingress
ipv6 address 2001:DB8:1111::2/64
ipv6 enable
tunnel source 50.50.50.59
tunnel mode ipv6ip
tunnel destination 209.51.161.14

interface FastEthernet0
ip address 50.50.50.59 255.255.255.248
ip access-group inbound in
no ip redirects
ip flow ingress
duplex auto
speed auto
no ip address
ipv6 address 2001:DB8:1111:1/64
ipv6 enable

ipv6 route 2001:DB8:F1F1::/48 2001:DB8:2222::1
ipv6 route ::/0 Tunnel0

ip access-list extended inbound
permit 41 host 209.51.161.14 host 50.50.50.59
permit tcp any host 50.50.50.59 eq 22
permit udp any eq domain host 50.50.50.59
permit icmp any host 50.50.50.59