Difference between pages "Google Chrome" and "SANS Institute"

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Google Chrome is a [[Web Browser|web browser]] developed by Google Inc.
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[[File:SANS.jpg|200px|thumb|right|alt text]] The [[SANS Institute]] was established in 1989 as a cooperative research and education organization. Its programs now reach more than 165,000 security professionals around the world. A range of individuals from auditors and network administrators, to chief information security officers are sharing the lessons they learn and are jointly finding solutions to the challenges they face. At the heart of SANS are the many security practitioners in varied global organizations from corporations to universities working together to help the entire information security community.
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SANS is the most trusted and by far the largest source for information security training and security certification in the world. It also develops, maintains, and makes available at no cost, the largest collection of research documents about various aspects of information security, and it operates the Internet's early warning system - the Internet Storm Center.
  
== Configuration ==
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[[Category:Organizations]]
The Google Chrome configuration can be found in the '''Preferences''' file.
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On Linux
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<pre>
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/home/$USER/.config/google-chrome/Default/Preferences
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</pre>
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On MacOS-X
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<pre>
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/Users/$USER/Library/Application Support/Google/Chrome/Default/Preferences
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</pre>
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On Windows XP
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<pre>
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C:\Documents and Settings\%USERNAME%\Local Settings\Application Data\Google\Chrome\User Data\Default\Preferences
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</pre>
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On Windows Vista and later
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<pre>
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C:\Users\%USERNAME%\AppData\Local\Google\Chrome\User Data\Default\Preferences
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</pre>
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Or for '''Chromium'''
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On Linux
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<pre>
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/home/$USER/.config/chromium/Default/Preferences
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</pre>
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On MacOS-X
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<pre>
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/Users/$USER/Library/Application Support/Chromium/Default/Preferences
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</pre>
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On Windows XP
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<pre>
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C:\Documents and Settings\%USERNAME%\Local Settings\Application Data\Chromium\User Data\Default\Preferences
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</pre>
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On Windows Vista and later
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<pre>
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C:\Users\%USERNAME%\AppData\Local\Chromium\User Data\Default\Preferences
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</pre>
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=== Plugins ===
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Information about plugins can be found under the "plugins section" of the Preferences file.
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=== DNS Prefetching ===
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DNS is prefetched for related sites, e.g. links on the page.
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This behavior is controlled by the setting "Predict network actions to improve page load performance", which is enabled by default.
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If enabled the Preferences file contains:
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<pre>
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  "dns_prefetching": {
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      "enabled": true,
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</pre>
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If disabled the Preferences file contains:
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<pre>
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  "dns_prefetching": {
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      "enabled": false,
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</pre>
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== Start-up DNS queries ==
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When Chrome starts it queries for several non-existing hostnames that consists of a 10 random characters, E.g.
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<pre>
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ttrgoiknff.mydomain.com
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bxjhgftsyu.mydomain.com
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yokjbjiagd.mydomain.com
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</pre>
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This is used to determine if your ISP is hijacking NXDOMAIN results [http://www.google.com/support/forum/p/Chrome/thread?tid=3511015c72a7b314&hl=en].
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== Disk Cache ==
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The Google Chrome disk cache can be found in:
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On Linux
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<pre>
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/home/$USER/.config/google-chrome/Default/Application Cache/Cache/
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</pre>
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On MacOS-X
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<pre>
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/Users/$USER/Caches/Google/Chrome/Default/Cache/
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</pre>
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On Windows XP
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<pre>
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C:\Documents and Settings\%USERNAME%\Local Settings\Application Data\Google\Chrome\User Data\Cache\
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</pre>
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On Windows Vista and later
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<pre>
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C:\Users\%USERNAME%\AppData\Local\Google\Chrome\User Data\Default\Cache\
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</pre>
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The Chrome Cache contains different files with the following file names:
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* index
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* data_#; where # contains a decimal digit.
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* f_######; where # contains a hexadecimal digit.
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For more info see Chrome developers site [http://www.chromium.org/developers/design-documents/network-stack/disk-cache].
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== History ==
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Chrome stores the history of visited sites in a file named '''History'''. This file uses the [[SQLite database format]].
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The '''History''' file can be found in same location as the '''Preferences''' file.
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There is also '''Archived History''' that predates information in the '''History''' file.
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Note that the '''Archived History''' only contains visits.
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=== Timestamps ===
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The '''History''' file uses the different timestamps.
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==== visits.visit_time ====
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The '''visits.visit_time''' is in (the number of) microseconds since January 1, 1601 UTC
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Some Python code to do the conversion into human readable format:
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<pre>
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date_string = datetime.datetime( 1601, 1, 1 )
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            + datetime.timedelta( microseconds=timestamp )
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</pre>
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Note that this timestamp is not the same as a Windows filetime which is (the number of) 100 nanoseconds since January 1, 1601 UTC
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==== downloads.start_time ====
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The '''downloads.start_time''' is in (the number of) seconds since January 1, 1970 UTC
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Some Python code to do the conversion into human readable format:
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<pre>
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date_string = datetime.datetime( 1970, 1, 1 )
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            + datetime.timedelta( seconds=timestamp )
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</pre>
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=== Example queries ===
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Some example queries:
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To get an overview of the visited sites:
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<pre>
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SELECT datetime(((visits.visit_time/1000000)-11644473600), "unixepoch"), urls.url, urls.title FROM urls, visits WHERE urls.id = visits.url;
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</pre>
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Note that the visit_time conversion looses precision.
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To get an overview of the downloaded files:
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<pre>
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SELECT datetime(downloads.start_time, "unixepoch"), downloads.url, downloads.full_path, downloads.received_bytes, downloads.total_bytes FROM downloads;
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</pre>
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How the information of the downloaded files is stored in the database can vary per version of Chrome as of version 26:
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<pre>
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SELECT datetime(((downloads.start_time/1000000)-11644473600), "unixepoch"), downloads.target_path, downloads_url_chains.url, downloads.received_bytes, downloads.total_bytes \
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FROM downloads, downloads_url_chains WHERE downloads.id = downloads_url_chains.id;
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</pre>
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== See Also ==
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* [[SQLite database format]]
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== External Links ==
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* [http://en.wikipedia.org/wiki/Google_Chrome Wikipedia article on Google Chrome]
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* [http://www.chromium.org/user-experience/user-data-directory The Chromium Projects - User Data Directory]
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* [http://www.chromium.org/developers/design-documents/network-stack/disk-cache Chrome Disk Cache]
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* [http://www.google.com/support/forum/p/Chrome/thread?tid=3511015c72a7b314&hl=en Chrome support forum article random 10 character hostnames on startup]
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* [http://www.useragentstring.com/pages/Chrome/ Chrome User Agent strings]
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* [http://computer-forensics.sans.org/blog/2010/01/21/google-chrome-forensics/ Google Chrome Forensics] by [[Kristinn Guðjónsson]], January 21, 2010
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* [http://linuxsleuthing.blogspot.ch/2013/02/cashing-in-on-google-chrome-cache.html?m=1 Cashing in on the Google Chrome Cache], [[John Lehr]], February 24, 2013
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* [http://www.obsidianforensics.com/blog/history-index-files-removed-from-chrome/ History Index files removed from Chrome v30], by Ryan Benson, October 2, 2013
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* [https://hindsight-internet-history.googlecode.com/files/Evolution_of_Chrome_Databases.png Evolution of Chrome Databases], by Ryan Benson, October 2, 2013
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== Tools ==
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=== Open Source ===
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* [https://code.google.com/p/hindsight-internet-history/ hindsight-internet-history]
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[[Category:Applications]]
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[[Category:Web Browsers]]
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Latest revision as of 15:45, 16 January 2014

alt text
The SANS Institute was established in 1989 as a cooperative research and education organization. Its programs now reach more than 165,000 security professionals around the world. A range of individuals from auditors and network administrators, to chief information security officers are sharing the lessons they learn and are jointly finding solutions to the challenges they face. At the heart of SANS are the many security practitioners in varied global organizations from corporations to universities working together to help the entire information security community.

SANS is the most trusted and by far the largest source for information security training and security certification in the world. It also develops, maintains, and makes available at no cost, the largest collection of research documents about various aspects of information security, and it operates the Internet's early warning system - the Internet Storm Center.