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Contents

SSL/TLS

SSL Testing

This command will display the TLS/SSL protocols that the web server supports:

nmap --script ssl-enum-ciphers -p 443 server.example.com

            Starting Nmap 7.40 ( https://nmap.org ) at 2020-11-02 19:53 CST
            Nmap scan report for server.example.com (192.168.50.50)
            Host is up (0.0034s latency).
            PORT    STATE SERVICE
            443/tcp open  https
            | ssl-enum-ciphers:
            |   TLSv1.2:
            |     ciphers:
            |       TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (secp256r1) - A
            |       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (secp256r1) - A
            |       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
            |       TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (dh 2048) - A
            |       TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 (dh 2048) - A
            |       TLS_DHE_RSA_WITH_AES_256_CBC_SHA (dh 2048) - A
            |     compressors:
            |       NULL
            |     cipher preference: server
            |     warnings:
            |       Key exchange (dh 2048) of lower strength than certificate key
            |       Key exchange (secp256r1) of lower strength than certificate key
            |_  least strength: A
            
            Nmap done: 1 IP address (1 host up) scanned in 0.78 seconds

Scanning for Certificate Usage and Expiration By Subnet

This command will scan the specified subnet and look for certificates on the common HTTPS ports 443 and 8443, then filter the output to include the subject, subject alternative name, and expiration timestamp.

This will only find certificates that are configured for the IP or the default server. If there are multiple sites / vhosts at the IP address configured with SNI, they will not be found with this command.

    nmap -p 443,8443 -sV -sC 172.21.0.0/24 | grep -E '(Nmap scan report|[0-9]+/tcp|ssl-cert|Subject Alternative Name|Not valid after)'

Validating Certificate Files

Test connecting using TLSv1.2 and TLSv1.3

    curl -vI --tlsv1.2 https://server.example.com
    curl -vI --tlsv1.3 https://server.example.com

From https://www.sslshopper.com/article-most-common-openssl-commands.html

    Check a Certificate Signing Request (CSR)
            openssl req -text -noout -verify -in CSR.csr
    Check a private key
            openssl rsa -in privateKey.key -check
    Check a certificate
            openssl x509 -in certificate.crt -text -noout
    Check a PKCS#12 file (.pfx or .p12)
            openssl pkcs12 -info -in keyStore.p12

If you use the 'openssl' tool, this is one way to get extract the CA cert for a particular server. This will show the certificate and also evaluate the certificate to show it's details. (using webserver.example.com as an example):

    openssl s_client -connect webserver.example.com:443 -servername webserver.example.com </dev/null | openssl x509 -text

The certificate will have "BEGIN CERTIFICATE" and "END CERTIFICATE" markers, and it's details are above the certificate.

If you want to trust the certificate, you can add it to your CA certificate store or use it stand-alone as described. Just remember that the security is no better than the way you obtained the certificate.

Verifying that certificate / private key / certificate signing request all match

(Info taken from https://kb.wisc.edu/page.php?id=4064)

Make sure the output of these 3 commands is the same. If so, then the Certificate / private key / csr match:

    openssl x509 -noout -modulus -in server.crt | openssl md5
    openssl rsa -noout -modulus -in server.key | openssl md5
    openssl req -noout -modulus -in server.csr | openssl md5

Info that expands upon the above:

The private key contains a series of numbers. Two of those numbers form the "public key", the others are part of your "private key". The "public key" bits are also embedded in your Certificate (we get them from your CSR). To check that the public key in your cert matches the public portion of your private key, you need to view the cert and the key and compare the numbers. To view the Certificate and the key run the commands:

    openssl x509 -noout -text -in server.crt
    openssl rsa -noout -text -in server.key

The 'modulus' and the 'public exponent' portions in the key and the Certificate must match. But since the public exponent is usually 65537 and it's bothering comparing long modulus you can use the following approach:

    openssl x509 -noout -modulus -in server.crt | openssl md5
    openssl rsa -noout -modulus -in server.key | openssl md5

Generate a private key

    openssl genrsa -out SERVER.key 4096

Generate a CSR

Generating a CSR with a SubjectAlternativeName included in a single line command (This requires that the /etc/ssl/openssl.cnf file exists - Tested on Debian):

    openssl req -new -sha256 -key SERVER.key -subj "/C=US/ST=State Name/localityName=City Name/O=Example Inc/emailAddress=youremail@example.com/CN=SERVER.example.com" -reqexts SAN -config <(cat /etc/ssl/openssl.cnf <(printf "[SAN]\nsubjectAltName=DNS:SERVER.example.com,DNS:www.SERVER.example.com,IP:0.0.0.0")) -out SERVER.csr

Links with related info:

https://bugs.chromium.org/p/chromium/issues/detail?id=700595&desc=2 https://bugs.chromium.org/p/chromium/issues/detail?id=308330 https://security.stackexchange.com/questions/74345/provide-subjectaltname-to-openssl-directly-on-command-line https://alexanderzeitler.com/articles/Fixing-Chrome-missing_subjectAltName-selfsigned-cert-openssl/

Generate a CSR without specifying the SubjectAlternativeName attribute (Fine when submitting a request to a public CA)

openssl req -new -sha256 -key SERVER.key -out SERVER.csr

    Country Name (2 letter code) [AU]:US
    State or Province Name (full name) [Some-State]:State Name
    Locality Name (eg, city) []:City name
    Organization Name (eg, company) [Internet Widgits Pty Ltd]:Example Inc
    Organizational Unit Name (eg, section) []:IT Department

Request Certificate from an Active Directory CA

Active Directory CA (Must use IE/Edge Browser): https://subordinate-ca.example.com/certsrv

  1. Request a Certificate
  2. Advanced certificate request
  3. "Submit a certificate request by using a base-64-encoded CMC or PKCS #10 file, or submit a renewal request by using a base-64-encoded PKCS #7 file. "
  4. Paste CSR and choose the appropriate web server certificate template
  5. Make sure to download the Base64 encoded version. Save as .crt

How to create a chained cert file

(order is top down)

  • Server cert (server.example.com)
  • Intermediate Cert
  • Root CA Cert
    • Not necessary…in fact some applications determine it is improper to include the root CA cert in the chain.

Example:

  • server.example.com (Server Certificate)
  • OV_NetworkSolutionsOVServerCA2.crt (Intermediate certificate)

Create PFX/PKCS12 file from PEM cert and key

The .pfx and .p12 file extensions are used interchangeably

Windows Servers tend to want the cert/key files in a pfx/pkcs12 format. Use these commands to create a pfx/pkcs12 file from PEM format key/cert files.

Create PFX/PKCS12 with friendlyname (-name):

    openssl pkcs12 -export -out filename.p12 -inkey key-filename.key -in cert-filename.crt -name "friendlyname text"

Create PFX/PKCS12 file with friendlyname (-name) and include cert chain file (-certfile):

    openssl pkcs12 -export -out filename.p12 -inkey key-filename.key -in cert-filename.crt -certfile cacert-filename.crt -name "friendlyname text"

Extract Certificate from PFX/PKCS12 file:

    openssl pkcs12 -in filename.p12 -nokeys -out cert-filename.crt

Extract Key from PFX/PKCS12 file:

    openssl pkcs12 -in filename.p12 -nocerts -nodes -out key-filename.key

Testing Public-Facing Web Servers

HTTPS Testing and Hardening Tools

Web Servers

Apache

Print the current Apache config

    apachectl -S

Test the current Apache config for errors

    apachectl configtest

List loaded apache modules

    apachectl -M

NGINX

Print the current NGINX config

    nginx -T

Test the NGINX config file for errors

    nginx -t

Storage

Finding Disk Usage

TUI Utility similar to WinDirStat on Windows

    ncdu

Get summary of disk usage of top level directories under / while avoiding paths that will just give undesirable output

    du -hs --exclude=/dev --exclude=/proc --exclude=/run --exclude=/sys /*

Check home directories to see what large files were created in the past day:

    find /home -size +100M -mtime -1 -exec du -hs {} \;

Disk is filling up, but running 'du -hs' on the directory doesn't show what is using the disk space.

In one case I found that rsyslogd was holding files open that were supposed to be deleted and were filling up the /var partition. To resolve the issue, I just had to restart rsyslog so it would let go of the file handles and allow them to be deleted. I used the following command to find that out:

    lsof | grep "/var" | grep deleted

If files cannot be written and df -h shows free space, check inode utilization

df -i

Resizing Virtual Disks

This command will poke at the SCSI controllers to look for changes. Helpful for detecting resized virtual disks without rebooting the VM.

    for i in /sys/class/scsi_device/*/device/rescan; do echo '- - -' >"$i"; done

The sg3_utils package in RHEL-based distributions provide a command that performs the same function

    scsi-rescan

Securely wiping a disk with Shred

The shred command can be used to securely wipe a disk. This command should be available on most systems. This command will make 3 passes of writing random data to the device, then a single pass of writing 0's to the device to hide the fact that it has been wiped.

    shred -vfz /dev/(device name without partition number)

DNS

Query for Active Directory Domain Controller SRV records

Example using dig:

dig srv _ldap._tcp.dc._msdcs.example.com

    user@workstation:~$ dig +noall +answer srv _ldap._tcp.dc._msdcs.example.com
    _ldap._tcp.dc._msdcs.example.com. 536   IN SRV  0 100 389 dc1.example.com.
    _ldap._tcp.dc._msdcs.example.com. 536   IN SRV  0 100 389 dc2.example.com.

Clearing DNS records from Active Directory cache

This is useful for DNS environments where Active Directory DNS is configured to perform lookups to another DNS system that is authoritative for internal DNS records. This will describe clearing the cache for individual records rather than the entire DNS cache

Run from an AD DNS Server

  1. Log into the AD DNS server that you want to clear the cached record from
  2. Run the following commands in Powershell depending on the type of record you are working with

    • Repeat for each AD DNS server that holds the cached record

      A Record

      Query for the record to see if it exists:

            Get-DnsServerResourceRecord -ZoneName ..cache -RRType A -Name server.example.com

      Remove the record:

            Remove-DnsServerResourceRecord -ZoneName ..cache -RRType A -Name server.example.com

      CNAME Record

      Query for the record to see if it exists:

            Get-DnsServerResourceRecord -ZoneName ..cache -RRType CNAME -Name server-cname.example.com

      Remove the record:

            Remove-DnsServerResourceRecord -ZoneName ..cache -RRType CNAME -Name server-cname.example.com

Run Remotely from a Workstation (Windows 8 or above REQUIRED)

Alternatively, these commands can be run from a regular workstation as long as Powershell is launched with a user account that has permission to modify the records. The following switch must be appended to the commands, and run once for each AD DNS server (dc1.example.com, dc2.example.com)

    -ComputerName dc1.example.com

Remote Server Administration Tools may need to be installed so that the required module is available to Powershell on your workstation. https://www.microsoft.com/en-us/download/details.aspx?id=45520

You can see if you have the necessary module by running this command in Powershell.

    Get-Module -ListAvailable DNSServer

Info gathered from:

Git

List Remotes

    git remote -v

Clean changes from repo including files that match .gitignore

    git clean -Xdf

Debugging git CLI comamnds

Enable trace logging with git commands

  • In Linux (bash): `GET_TRACE=1
  • In Windows (CMD): set GIT_TRACE=1
  • In Windows (Powershell): `$env:GIT_TRACE=1

Increase the verbosity of the git SSH command

    GIT_SSH_COMMAND="ssh -vvv" git fetch

The loglevel can be turned up on per host in ~/.ssh/config:

    Host github.com
            LogLevel DEBUG3

Show all current configuration

    git config --global --list

Gitlab Specific

Generate list of active users and email addresses from Gitlab API

I used this API query once in a while to grab the e-mail addresses of all active users on a Gitlab instance.

    curl -L --header "PRIVATE-TOKEN: <REPLACE WITH VALID TOKEN>" "https://gitlab.example.com/api/v4/users?active=true&per_page=500" | jq -r '.[] | .email' | sort

Documentation: https://docs.gitlab.com/ee/api/users.html

Purging data from Git repositories

If large binary files or executables have been stored in a git repository and you would like to clean them, this tutorial from Gitlab is helpful:
https://docs.gitlab.com/17.0/ee/user/project/repository/reducing_the_repo_size_using_git.html

This requires the git-filter-repo package which is only available in Debian 10+ and Ubuntu 22+. Alternatively, it can be downloaded directly from the source repository and ran with python3 git-filter-repo

This is the actual command I used to remove the large files from the repo (in step 8 of the Gitlab doc)

    git filter-repo --invert-paths --path path/to/folder --path path/to/file1 --path path/to/file2

After running the "git filter-repo" command, there is a file in the project directory under "filiter-repo/commit-map". This file needs to be preserved and uploaded to the Gitlab server during the "Repository cleanup" section at the bottom of the document. Without this, the Gitlab server won't actually reduce the size of the repo.

After running through this process, I was able to drop the repo size from 700MB to 5MB.

NOTE: This process can also be used to delete files containing sensitive information from repositories, but it MAY not completely remove it.

SaltStack

Useful Commands

Watch the Salt Event Bus:

    salt-run state.event pretty=True

Refresh fileserver immediately:

    salt-run fileserver.update

View directory list for an environment:

    salt-run fileserver.dir_list saltenv=test

View file list for an environment:

    salt-run fileserver.file_list saltenv=test

Troubleshoot a highstate run:

    salt-call -l debug state.apply

Look-up job id:

    salt-run jobs.lookup_jid <job id number>

Show currently running jobs:

    salt-run jobs.active

MySQL

MySQL Common Commands

Creating a database and assigning a user all privileges:

    CREATE DATABASE exampledb_dev;
    CREATE USER 'exampleuser'@'%' IDENTIFIED BY '$password';        # % means the user can log in from any location
    GRANT ALL PRIVILEGES ON exampledb_dev.* TO 'exampleuser'@'%';
    FLUSH PRIVILEGES;

Checking grants:

    show grants for 'exampledb'@'%';
    FLUSH PRIVILEGES;

Revoke a single privilege from a single database (Database name must be specified): (note the use of backticks around the database name)

    REVOKE CREATE VIEW on `exampledb\_dev`.* FROM 'exampledb_dev'@'%';

Changing host for a user:

    UPDATE mysql.user SET host = '%' WHERE user = 'exampleuser';

Show all users:

    select user,host from mysql.user;

Drop a database and user:

    DROP DATABASE exampledb_dev;
    DROP USER 'exampleuser'@'%';

Show variables for innodb engine;

    SHOW VARIABLES LIKE 'innodb_file_format%';

Set default character set and collation of a database:

    ALTER DATABASE dbname DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;

Look at views that exist on all databases:

    select * FROM information_schema.views;

Remove a single view from a database:

    drop view exampledb_dev.exampleview;

Determine the amount of disk space being used by each database on a server:

    SELECT table_schema AS "Database", SUM(data_length + index_length) / 1024 / 1024 AS "Size (MB)" FROM information_schema.TABLES GROUP BY table_schema;

Show all stored procedures on a database server:

    SHOW PROCEDURE STATUS;

Show current connections to a database:

    SHOW PROCESSLIST;

Kill off query that is being problematic:

    Determine the "ID" of the query that needs to be killed
            SHOW PROCESSLIST;

    Kill the offending query:
            kill <query ID>;

Repair a crashed table:

    repair table table_name;

Extracting a table from a mysqldump file

Extract the table ‘exampleTable’ from the gzipped database dump file exampledb_12232021.sql (generated from the 'exampledb' database)

    zcat /var/backups/mysql/exampledb_20211223.sql.gz | sed -n -e '/CREATE TABLE.*`exampleTable`/,/CREATE TABLE/p' > exampleTable_12232021.sql

Delete the drop/create lines of the next database from the bottom of the file (manually)

vim exampleTable_12232021.sql

Rename the table to something else so it can be re-imported:

    sed -i 's/`exampleTable`/`exampleTable_12232021`/g' exampleTable_12232021.sql

Re-import the table to the database with the new name:

mysql -uroot -p"$(</root/.sql_passwd)" exampledb < exampledb_12232021.sql
  • Might need to manually copy the lines from just above the 'CREATE TABLE' line which configure the character set, etc.

Networking

Managing TCP Sessions

Managing TCP Connections To kill a currently established TCP connection, the following command can be used: (using a destination ip/port of 192.168.50.50 and 389 as an example

    ss -K dst 192.168.50.50 dport = 389

Clearing ARP cache

ESXi 5.1

View ARP cache:

    esxcli network ip neighbor list

Remove an item from ARP cache:

    vsish -e set /net/tcpip/v4/neighbor del IPADDRESS

Debian

View ARP cache:

    arp

View ARP cache (IP only, don't resolve hostnames):

    arp -n

Remove an item from ARP cache:

    arp -d IPADDRESS

Gratuitous ARP

Useful when replacing a server and the new one has a new MAC address. This will announce the new MAC address that is associated with the IP address to devices on the local network:

    arping -A -I eth0 IPADDRESS

View Network Interface Details (Linux)

Using ethtool to view the "ens18" interface:

[root@server ~]# ethtool ens18
Settings for ens18:
	Supported ports: [ TP ]
	Supported link modes:   10baseT/Half 10baseT/Full
							100baseT/Half 100baseT/Full
							1000baseT/Full
	Supported pause frame use: No
	Supports auto-negotiation: Yes
	Supported FEC modes: Not reported
	Advertised link modes:  10baseT/Half 10baseT/Full
							100baseT/Half 100baseT/Full
							1000baseT/Full
	Advertised pause frame use: No
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Speed: 1000Mb/s
	Duplex: Full
	Auto-negotiation: on
	Port: Twisted Pair
	PHYAD: 0
	Transceiver: internal
	MDI-X: off (auto)
	Supports Wake-on: umbg
	Wake-on: d
		Current message level: 0x00000007 (7)
							drv probe link
	Link detected: yes

VMware PowerCLI

Gather VM names that have snapshots from VMware with a powershell module (requires vmware powercli) connect-viserver vcenter.example.com

    get-vm | get-snapshot | format-list vm, name, description, created, sizegb | out-file snapshots.csv

Linux - Useful Commands

Debian

List files within a Deb package

  • Downloaded Deb Package:
    dpkg --contents <rpmname>.deb
  • Installed Deb Package:
    dpkg -L <package name>

Determine the package a file comes from:

    dpkg -S /path/to/file

Find Package Dependencies

  • Recursive dependencies for a package:
    apt depends --recurse <package name>
  • Reverse dependency lookup based on installed packages:
    apt rdepends --installed

RHEL

View file/folder permissions set by package (NGINX as an example)

    rpm -q --queryformat="[%{FILEMODES:perms} %{FILENAMES}\n]" nginx

Clean up old kernels (Preserving the current and 1 previous version):
https://access.redhat.com/solutions/1227

  • RHEL 5/6/7 (requires yum-utils package):

    package-cleanup --oldkernels --count=2

  • RHEL 8/9:

    dnf remove $(dnf repoquery --installonly --latest-limit=-2 -q)

List enabled/disabled/all repositories

    yum repolist enabled
    yum repolist disabled
    yum repolist all

Disable a repository for a single yum transaction Useful if the repository is being problematic

    yum --disablerepo="reponame" info openssh

    Alternatively, a repo can be enabled for a single yum transaction by using the --enablerepo option

Show all available versions of a package

    yum --showduplicates list <package name>

Install specific version of a package

    yum install <package name>-<version number>

List files within an RPM package

  • Downloaded RPM Package:
    rpm -qlp <name>.rpm
  • Installed RPM Package:
    rpm -ql <package name>

Determine the package a file comes from:

  • yum whatprovides /path/to/file
  • rpm -qf /path/to/file
  • dnf provides /bin/ps

List all packages that are installed from a specific repo (using the EPEL repo as an example):

  • dnf list installed | grep @epel
  • dnf repo-pkgs epel list installed

Finding Package Dependencies

  • With an rpm file:
    rpm -qpR <package name>.rpm
  • With an installed package:
    rpm -qR <package name>
  • With repoquery (included in the dnf-utils or yum-utils package):
    repoquery --requires --resolve <package name>
  • With repoquery (recursive):
    repoquery --requires --resolve --recursive <package name>
  • With repoquery (reverse lookup):
    repoquery --whatdepends <package name> --installed

List what capabilities a package provides

  • rpm -q --provides <package name>

Replace one similar/equivalent package with another

  • dnf --allowerasing <new package>
  • dnf swap <old package> <new package>

List all packages available in all enabled repositories:

    dnf list --all

View Package Changelog (from repo):

    dnf changelog <package name>

View Package Changelog (currently installed package):

    rpm -q --changelog <package name>

Simulate Updates:

    dnf update --assumeno

Install only package updates that resolve a CVE or multiple CVEs:

    dnf update --cve=CVE-####-####
    dnf update --cves=CVE-####-####,CVE-####-####,CVE-####-####

Install only package updates that resolve an advisory:

    dnf update --advisory=RHSA-XXXX:XXXX
    dnf update --advisories=RHSA-XXXX:XXXX,RHSA-XXXX:XXXX,RHSA-XXXX:XXXX

Install all security updates updates:

    dnf update --security

List security updates that have been installed on a server:

    dnf updateinfo security --installed

Other Useful RHEL Links:

Fix Yum if the command "hangs" and does not return output

	Check for processes holding the RPM database open. Kill any processes that are listed
		lsof | grep /var/lib/rpm
	Delete the rpm db lock files
		rm -f /var/lib/rpm/__*
	Rebuild the RPM indexes
		rpm -vv --rebuilddb
	Verify the RPM database
		cd /var/lib/rpm
		/usr/lib/rpm/rpmdb_verify Packages
	
	More Info Here
	https://access.redhat.com/solutions/6903

Linux Benchmarking

The tools below can be found in Debian and RHEL repositories

CPU and RAM Benchmarking Tool: sysbench

CPU Test

    sysbench cpu --threads=<number of cores> run

RAM Test

    sysbench memory run

Storage Benchmarking Tool: fio

Random Reads

    sync; fio --randrepeat=1 --ioengine=libalo --direct=1 --name=test --filename=test --bs=4k --size=4G --readwrite=randread --ramp_time=4

Random Writes

    sync; fio --randrepeat=1 --ioengine=libalo --direct=1 --name=test --filename=test --bs=4k --size=4G --readwrite=randwrite --ramp_time=4

Network Benchmarking Tool: iperf3

You will need two servers for this test. One will act as the client and one will act as the server. These commands will run a 30 second test showing the speed that can be achieved between the two systems.

Server Command

    iperf3 -s -p 5201

Client Command

    iperf -c <ip of server running iperf3> -p 5201 -t 30s

Miscellaneous

Determining the purpose of a server

I usually use a combination of looking at running services in systemctl list-units, which ports have processes bound to them or sockets established with netstat -nlp, look at crons that are configured with crontab -l or looking at what exists in /var/spool/cron and then follow breadcrumbs from there.

Commands to determine if a server is physical or virtual (by order of likeliness to exist on the system)

    dmidecode -s system-manufacturer
    systemd-detect-virt
    virt-what

WSL - Windows Subsystem for Linux

Disable Terminal Beep

Disable the source of the beeps

from https://stackoverflow.com/a/36726662/5145596

Note: These only apply to the local terminal and will not apply to SSH sessions

  1. To disable the beep in bash you need to uncomment (or add if not already there) the line set bell-style none in your /etc/inputrc file.

  2. To disable the beep and the visual bell also in vim you need to add the following to your ~/.vimrc file:

     set visualbell
 set t_vb=

  3. To disable the beep also in less (i.e. also in man pages and when using "git diff") you need to add export LESS="$LESS -R -Q" in your ~/.profile file.

Disable the terminal beep sound in Windows - Possibly a better approach

The "Critical Stop" sound in Windows is what is played when terminal beeps occur. Setting the sound to "(none)" doesn't disable the sound, but instead causes a different default sound to be played. A better option is to generate a slient WAV format file and set that as the sound for "Critical Stop"

  1. Install the sox package (Swiss army knife of sound processing)
  2. Run this command to generate a file named "silence.wav" that contains .5 seconds of silence: sox -n -r 44100 -c 2 slience.wav trim 0.0 0.5
  3. Move the file to a location where Windows can access it
  4. Open "Change system sounds" from the control panel, locate the "Critical Stop" sound and set it to the silence.wav file that was created. Click Apply

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