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Additional cheat files (#139)
* Most common openssl commands * Most common java keytool commands
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cheats/keytool.cheat
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cheats/keytool.cheat
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% java keytool, certificate, encryption
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## Creating
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# Generate a Java keystore and key pair
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keytool -genkey -alias <ALIAS> -keyalg RSA -keystore <OUTPUT_JKS> -keysize <RSA_LENGTH>
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# Generate a certificate signing request (CSR) for an existing Java keystore
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keytool -certreq -alias <ALIAS> -keystore <INPUT_JKS> -file <OUTPUT_CSR>
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# Import a root or intermediate CA certificate to an existing Java keystore
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keytool -import -trustcacerts -alias root -file <INPUT_CRT> -keystore <INPUT_JKS>
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# Import a signed primary certificate to an existing Java keystore
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keytool -import -trustcacerts -alias <ALIAS> -file <INPUT_CRT> -keystore <INPUT_JKS>
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# Generate a keystore and self-signed certificate
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keytool -genkey -keyalg RSA -alias <ALIAS> -keystore <OUTPUT_JKS> -storepass <PASSWORD> -validity <VALIDITY> -keysize <RSA_LENGTH>
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## Verifying
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# Check a stand-alone certificate
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keytool -printcert -v -file <INPUT_CRT>
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# Check which certificates are in a Java keystore
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keytool -list -v -keystore <INPUT_JKS>
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# Check a particular keystore entry using an alias
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keytool -list -v -keystore <INPUT_JKS> -alias <ALIAS>
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## Other
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# Remove a certificate from a keystore
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keytool -delete -alias <ALIAS> -keystore <INPUT_JKS>
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# Change the password of a keystore
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keytool -storepasswd -keystore <INPUT_JKS> -new <NEW_PASSWORD>
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# Export a certificate from a keystore
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keytool -export -alias <ALIAS> -file <OUTPUT_CRT> -keystore <INPUT_JKS>
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# List the trusted CA Certs from the default Java Trusted Certs Keystore
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keytool -list -v -keystore $JAVA_HOME/jre/lib/security/cacerts
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# Import New Certificate Authority into the default Java Trusted Certs Keystore
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keytool -import -trustcacerts -file <INPUT_PEM> -alias <ALIAS> -keystore $JAVA_HOME/jre/lib/security/cacerts
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# Sensible/common default alternatives
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$ VALIDITY: printf "DAYS\tCOMMENT\n1\ta day\n30\ta month\n365\ta year\n730\ttwo years" --- --column 1 --headers 1
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$ RSA_LENGTH: printf "KEY LENGTH\tCOMMENT\n2048\t\tDefault\n4096\t\tBetter\n8192\t\tSlow?" --- --column 1 --headers 1
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# Attempt to find files with the appropriate endings, default to everything.
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$ INPUT_CRT: ls -a | grep -e "\(.crt\|.cer\|.der\)" || ls -a
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$ INPUT_PEM: ls -a | grep -e "\(.pem\)" || ls -a
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$ INPUT_JKS: ls -a | grep -e "\(.jks\)" || ls -a
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81
cheats/openssl.cheat
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81
cheats/openssl.cheat
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% openssl, certificate, encryption
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## General OpenSSL Commands
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# Create a new signing request and key
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openssl req -new -newkey rsa:<RSA_LENGTH> -nodes -out <OUTPUT_CSR> -keyout <OUTPUT_KEY>
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# Create a new self-signed certificate
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openssl req -x509 -sha256 -nodes -days <VALIDITY> -newkey rsa:<RSA_LENGTH> -out <OUTPUT_CRT> -keyout <OUTPUT_KEY>
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# Create a signing request from existing key
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openssl req -out <OUTPUT_CSR> -key <INPUT_KEY> -new
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# Create a signing request from existing certificate and key
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openssl x509 -x509toreq -out <OUTPUT_CSR> -in <INPUT_CRT> -signkey <INPUT_KEY>
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# Remove a passphrase from a private key
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openssl rsa -in <INPUT_KEY> -out <OUTPUT_PLAINTEXT_KEY>
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## Converting between the different encoding
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# Convert a DER encoded file to a PEM encoded file
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openssl x509 -inform der -in <INPUT_CRT> -out <OUTPUT_PEM>
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# Convert a PEM encoded file to a DER encoded file
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openssl x509 -outform der -in <INPUT_PEM> -out <OUTPUT_CRT>
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# Convert a PKCS12 encoded file containing a private key and certificates to PEM
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openssl pkcs12 -in <INPUT_PKCS12> -out <OUTPUT_PEM> -nodes
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# Extract the private key from a PKCS12 encoded file
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openssl pkcs12 -in <INPUT_PKCS12> -out <OUTPUT_PEM> -nodes -nocerts
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# Extract the certificate from a PKCS12 encoded file
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openssl pkcs12 -in <INPUT_PKCS12> -out <OUTPUT_PEM> -nodes -nokeys
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# Convert a PEM certificate file and a private key to PKCS12 encoded file
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openssl pkcs12 -export -out <OUTPUT_PKCS12> -inkey <INPUT_KEY> -in <INPUT_CRT> -certfile <INPUT_CRT>
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## Validating certificates and keys using OpenSSL
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# Validate a certificate signing request
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openssl req -text -noout -verify -in <OUTPUT_CSR>
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# Validate a private key
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openssl rsa -in <INPUT_KEY> -check
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# Validate a certificate
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openssl x509 -in <INPUT_CRT> -text -noout
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# Validate a PKCS12 file (.pfx or .p12)
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openssl pkcs12 -info -in <INPUT_PKCS12>
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## Debugging using OpenSSL
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# Compare the MD5 hash of a certificate
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openssl x509 -noout -modulus -in <INPUT_CRT> | openssl md5
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# Compare the MD5 hash of a private key
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openssl rsa -noout -modulus -in <INPUT_KEY> | openssl md5
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# Compare the MD5 hash of a certificate signing request
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openssl req -noout -modulus -in <INPUT_CSR> | openssl md5
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# Display the server certificate chain
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openssl s_client -connect <URL>:<PORT>
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# Sensible/common default alternatives
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$ VALIDITY: printf "DAYS\tCOMMENT\n1\ta day\n30\ta month\n365\ta year\n730\ttwo years" --- --column 1 --headers 1
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$ RSA_LENGTH: printf "KEY LENGTH\tCOMMENT\n2048\t\tDefault\n4096\t\tBetter\n8192\t\tSlow?" --- --column 1 --headers 1
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# Attempt to find files with the appropriate endings, default to everything.
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$ INPUT_PKCS12: ls -a | grep -e "\(.pfx\|.p12\)" || ls -a
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$ INPUT_CSR: ls -a | grep -e "\(.csr\)" || ls -a
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$ INPUT_KEY: ls -a | grep -e "\(.key\|.pem\)" || ls -a
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$ INPUT_CRT: ls -a | grep -e "\(.crt\|.cer\|.der\)" || ls -a
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$ INPUT_PEM: ls -a | grep -e "\(.pem\)" || ls -a
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