Difference between revisions of "Openssl"

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*sclient
 
*sclient
  
==Documentation and HOWTOs==
 
*[http://sial.org/howto/openssl/ca/ OpenSSL Certificate Authority Setup]
 
*[http://www.herongyang.com/Cryptography/OpenSSL-Certificate-Path-Validation-Tests.html Validating a Certificate Path with OpenSSL]
 
*[http://www.techradar.com/news/software/how-ssl-and-tls-works-1047412 How SSL and TLS work]
 
*[https://jamielinux.com/docs/openssl-certificate-authority/index.html OpenSSL Certificate Authority]
 
*http://dataslinger.com/index.php?/archives/5-Configuring-SSL-certificates-for-Apache,-Dovecot,-Sendmail,-and-IIS.html
 
*[http://www.eclectica.ca/howto/ssl-cert-howto.php ssl cert HOWTO]
 
*[http://www.madboa.com/geek/openssl/ OpenSSL Command-Line HOWTO]
 
*[http://wiki.cacert.org/wiki/VhostTaskForce#head-f7f4c7599aef8b22de373b0922b39f4e75e95db4 1. Way: SubjectAltName Only]
 
*[http://www.madboa.com/geek/openssl/ OpenSSL Command-Line HOWTO]
 
*[http://www.digicert.com/ssl-support/pem-ssl-creation.htm How to Create a .PEM file for SSL Certificate Installation]
 
*http://www.tc.umn.edu/~brams006/selfsign.html
 
*[https://kb.wisc.edu/middleware/page.php?id=4064 Verifying that a Private Key Matches a Certificate]
 
*[https://medium.com/@superseb/get-your-certificate-chain-right-4b117a9c0fce Getting your certificate chain right]
 
*[https://stackoverflow.com/questions/25482199/verify-a-certificate-chain-using-openssl-verify Verify certificate chain]
 
  
===Dovecot and ssl===
+
== Documentation and HOWTOs ==
 +
 
 +
*[http://sial.org/howto/openssl/ca/ OpenSSL Certificate Authority Setup]
 +
*[http://www.herongyang.com/Cryptography/OpenSSL-Certificate-Path-Validation-Tests.html Validating a Certificate Path with OpenSSL]
 +
*[http://www.techradar.com/news/software/how-ssl-and-tls-works-1047412 How SSL and TLS work]
 +
*[https://jamielinux.com/docs/openssl-certificate-authority/index.html OpenSSL Certificate Authority]
 +
*[http://dataslinger.com/index.php?/archives/5-Configuring-SSL-certificates-for-Apache,-Dovecot,-Sendmail,-and-IIS.html http://dataslinger.com/index.php?/archives/5-Configuring-SSL-certificates-for-Apache,-Dovecot,-Sendmail,-and-IIS.html]
 +
*[http://www.eclectica.ca/howto/ssl-cert-howto.php ssl cert HOWTO]
 +
*[http://www.madboa.com/geek/openssl/ OpenSSL Command-Line HOWTO]
 +
*[http://wiki.cacert.org/wiki/VhostTaskForce#head-f7f4c7599aef8b22de373b0922b39f4e75e95db4 1. Way: SubjectAltName Only]
 +
*[http://www.madboa.com/geek/openssl/ OpenSSL Command-Line HOWTO]
 +
*[http://www.digicert.com/ssl-support/pem-ssl-creation.htm How to Create a .PEM file for SSL Certificate Installation]
 +
*[http://www.tc.umn.edu/~brams006/selfsign.html http://www.tc.umn.edu/~brams006/selfsign.html]
 +
*[https://kb.wisc.edu/middleware/page.php?id=4064 Verifying that a Private Key Matches a Certificate]
 +
*[https://medium.com/@superseb/get-your-certificate-chain-right-4b117a9c0fce Getting your certificate chain right]
 +
*[https://stackoverflow.com/questions/25482199/verify-a-certificate-chain-using-openssl-verify Verify certificate chain]
 +
*[https://langui.sh/2009/03/14/checking-a-remote-certificate-chain-with-openssl/ Checking A Remote Certificate Chain With OpenSSL]
 +
 
 +
 
 +
=== Dovecot and ssl ===
 +
 
 +
Networksolutions certs: After creating myserver.key and myserver.csr and obtaining certs: (don't forget to insert newlines between the blocks!)
  
Networksolutions certs:
 
After creating myserver.key and myserver.csr and obtaining certs:
 
(don't forget to insert newlines between the blocks!)
 
 
  cat OV_NetworkSolutionsOVServerCA2.crt OV_USERTrustRSACertificationAuthority.crt AddTrustExternalCARoot.crt > intermediate.pem
 
  cat OV_NetworkSolutionsOVServerCA2.crt OV_USERTrustRSACertificationAuthority.crt AddTrustExternalCARoot.crt > intermediate.pem
 
   
 
   
 +
 
In dovecot.conf:
 
In dovecot.conf:
 +
 
  ssl_cert_file = /usr/local/etc/IMAP.EXAMPLE.COM.crt
 
  ssl_cert_file = /usr/local/etc/IMAP.EXAMPLE.COM.crt
 
  ssl_key_file = /usr/local/etc/myserver.key
 
  ssl_key_file = /usr/local/etc/myserver.key
Line 41: Line 46:
 
  #ssl_ca_file = /usr/local/etc/intermediate.pem
 
  #ssl_ca_file = /usr/local/etc/intermediate.pem
  
===Courier-imap and ssl===
+
=== Courier-imap and ssl ===
*http://linsec.ca/Using_Courier-IMAP_and_SSL
+
 
*http://linux.seindal.dk/2005/12/04/making-a-courier-imap-ssl-sertificate/
+
*[http://linsec.ca/Using_Courier-IMAP_and_SSL http://linsec.ca/Using_Courier-IMAP_and_SSL]
 +
*[http://linux.seindal.dk/2005/12/04/making-a-courier-imap-ssl-sertificate/ http://linux.seindal.dk/2005/12/04/making-a-courier-imap-ssl-sertificate/]
  
 +
Networksolutions certs: After creating myserver.key and myserver.csr and obtaining certs: (don't forget to insert newlines between the blocks!)
  
Networksolutions certs:
 
After creating myserver.key and myserver.csr and obtaining certs:
 
(don't forget to insert newlines between the blocks!)
 
 
  cat AddTrustExternalCARoot.crt NetworkSolutions_CA.crt > intermediate.pem
 
  cat AddTrustExternalCARoot.crt NetworkSolutions_CA.crt > intermediate.pem
 
  cat myserver.key >> IMAP.EXAMPLE.COM.crt
 
  cat myserver.key >> IMAP.EXAMPLE.COM.crt
  
 
In imapd-ssl:
 
In imapd-ssl:
 +
 
  TLS_CERTFILE=/usr/local/etc/courier-certs/IMAP.EXAMPLE.COM.crt
 
  TLS_CERTFILE=/usr/local/etc/courier-certs/IMAP.EXAMPLE.COM.crt
 
  TLS_TRUSTCERTS=/usr/local/etc/courier-certs/intermediate.pem
 
  TLS_TRUSTCERTS=/usr/local/etc/courier-certs/intermediate.pem
  
===Network Solutions certificates bundle===
+
=== Network Solutions certificates bundle ===
See http://blog.irontechsolutions.com/2008/12/10/ssl-chained-certificates-explained/  
+
 
 +
See [http://blog.irontechsolutions.com/2008/12/10/ssl-chained-certificates-explained/ http://blog.irontechsolutions.com/2008/12/10/ssl-chained-certificates-explained/]
  
 
  cat OV_NetworkSolutionsOVServerCA2.crt OV_USERTrustRSACertificationAuthority.crt AddTrustExternalCARoot.crt > intermediate.txt
 
  cat OV_NetworkSolutionsOVServerCA2.crt OV_USERTrustRSACertificationAuthority.crt AddTrustExternalCARoot.crt > intermediate.txt
  
 +
 
 +
 +
=== Comodo bundle order ===
  
===Comodo bundle order===
 
 
COMODORSAOrganizationValidationSecureServerCA. + COMODO rsa add trust ca ( + addtrustexternalcaroot )
 
COMODORSAOrganizationValidationSecureServerCA. + COMODO rsa add trust ca ( + addtrustexternalcaroot )
  
===Generate a signing request===
+
=== Generate a signing request ===
 +
 
 
  openssl req -nodes -newkey rsa:2048 -keyout my.domain.key -out my.domain.csr
 
  openssl req -nodes -newkey rsa:2048 -keyout my.domain.key -out my.domain.csr
  
 
The resulting csr is the signing request, my.domain.key is the private key you save not readable for anyone but root!
 
The resulting csr is the signing request, my.domain.key is the private key you save not readable for anyone but root!
 
  
 
== Tips&Tricks ==
 
== Tips&Tricks ==

Revision as of 14:52, 21 October 2021

Links


Tools

  • sslscan
  • sclient


Documentation and HOWTOs


Dovecot and ssl

Networksolutions certs: After creating myserver.key and myserver.csr and obtaining certs: (don't forget to insert newlines between the blocks!)

cat OV_NetworkSolutionsOVServerCA2.crt OV_USERTrustRSACertificationAuthority.crt AddTrustExternalCARoot.crt > intermediate.pem

In dovecot.conf:

ssl_cert_file = /usr/local/etc/IMAP.EXAMPLE.COM.crt
ssl_key_file = /usr/local/etc/myserver.key
#optional, only if you want to require client to provide cert
#ssl_ca_file = /usr/local/etc/intermediate.pem

Courier-imap and ssl

Networksolutions certs: After creating myserver.key and myserver.csr and obtaining certs: (don't forget to insert newlines between the blocks!)

cat AddTrustExternalCARoot.crt NetworkSolutions_CA.crt > intermediate.pem
cat myserver.key >> IMAP.EXAMPLE.COM.crt

In imapd-ssl:

TLS_CERTFILE=/usr/local/etc/courier-certs/IMAP.EXAMPLE.COM.crt
TLS_TRUSTCERTS=/usr/local/etc/courier-certs/intermediate.pem

Network Solutions certificates bundle

See http://blog.irontechsolutions.com/2008/12/10/ssl-chained-certificates-explained/

cat OV_NetworkSolutionsOVServerCA2.crt OV_USERTrustRSACertificationAuthority.crt AddTrustExternalCARoot.crt > intermediate.txt

 

Comodo bundle order

COMODORSAOrganizationValidationSecureServerCA. + COMODO rsa add trust ca ( + addtrustexternalcaroot )

Generate a signing request

openssl req -nodes -newkey rsa:2048 -keyout my.domain.key -out my.domain.csr

The resulting csr is the signing request, my.domain.key is the private key you save not readable for anyone but root!

Tips&Tricks

Create private key (using config file)

openssl req (-config /etc/pki/tls/www.example.com.cnf) -newkey rsa:2048 -nodes -keyout domain.key

Create CSR using config file

openssl req -config /etc/pki/tls/www.example.com.cnf -new -newkey rsa:2048 -nodes -keyout example.com.key -out www.example.com.csr

Convert der to pem

openssl x509 -inform der -in certificate.cer -out certificate.pem

Creating CSR for multiple hosts

For example http://blog.endpoint.com/2014/10/openssl-csr-with-alternative-names-one.html

Remove password from private key

https://wiki.apache.org/httpd/RemoveSSLCertPassPhrase

Examining certificates

openssl verify cert.pem
openssl x509 -in cacert.pem -noout -text
openssl x509 -in foo.pem  -inform pem -noout -text 
openssl rsa -noout -text -in server.key
openssl req -noout -text -in server.csr
openssl rsa -noout -text -in ca.key
openssl x509 -noout -text -in ca.crt

with expiration date:

openssl x509 -noout -text -enddate -in ca.crt
  1. to check CN
openssl x509 -in server.crt -noout -subject
openssl pkcs12 -info -in keyStore.p12
openssl pkcs12 -info -in keyStore.pfx


Checking a service

  1. Note -CApath should point to your local collection of public CA certs
openssl s_client -connect -CApath /etc/ssl/certs host:pop3 -starttls pop3
openssl s_client -port 443 -CApath /etc/ssl/certs -host webmail.example.com -prexit
openssl s_client -connect imap.example.com:143 -starttls imap
openssl s_client -connect web.server:443 -showcerts
openssl s_client -connect webmail.example.com:443 -servername vhost.example.com

Just check expiration date:

 openssl s_client -connect imap.example.com:143 -starttls imap 2>/dev/null | openssl x509 -noout -dates

 

Check your site


gnutls-cli

echo quit | gnutls-cli --starttls-proto smtp --port 25 servac.skk | grep Status
echo quit | gnutls-cli --port 465 servac.skk | grep Status

check if certs match

TODO: -clr_check too

openssl pkey -in privateKey.key -pubout -outform pem | sha256sum 
openssl x509 -in certificate.crt -pubkey -noout -outform pem | sha256sum 
openssl req -in CSR.csr -pubkey -noout -outform pem | sha256sum

These values show match Also:

openssl verify -CAfile ca-bundle foo_bar.crt

A script to do these checks: [sslcheck]

Creating your own CA and signing with it

(based on http://www.eclectica.ca/howto/ssl-cert-howto.php#rootc)

cd /etc/ssl
mkdir newcerts
(perform secret rituals)



FAQ

using s_client

no client certificate sent

try adding -cert

Can't use SSL_get_servername

Try using hostname instead of IP address

write:errno=104

server reset the connection

unable to load client certificate private key file

Verification error: unable to verify the first certificate

problem missing CA cert

error 20 at 0 depth lookup: unable to get local issuer certificate

you probably need to provide the right -CAfile maybe self signed?

 

Verify return code: 21 (unable to verify the first certificate)

Probably requires bundle

 

Bad certificate (code 42)

Means the server demands you authenticate with a certificate, and you did not do so, and that caused the handshake failure.


check certificate chain

openssl s_client -connect www.example.com:443 -showcerts
      


Some of the output

Certificate chain

0 s:CN = foo.local
  i:CN = foo.local-CA

0: first in chain

s: subject  ( openssl x509 -noout -in foo.crt -subject )

i: issuer ( openssl x509 -noout -in foo.crt -issuer )

check expiration date

echo | openssl s_client -servername NAME -connect HOST:PORT 2>/dev/null | openssl x509 -noout -dates

 

139814102202256:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:707:Expecting: TRUSTED CERTIFICATE

i've seen this happen when someone deleted the BEGIN/END CERTIFICATE lines

or a file is in DER format

SSL CTX certificate file error: error:0906D06C:PEM routines:PEM_read_bio:no start line

??

 

 

check if webserver supports old tls

openssl s_client -connect www.example.com:443 -tls1
openssl s_client -connect www.example.com:443 -tls1_1

or when vhost:

 openssl s_client -servername vhost.example.com -connect www.example.com:443 -tls1_1

 

ERROR: Certificate verification: Not trusted

seems to be an lftp issue

unsupported certificate purpose

??

ssllabs checks

Chain issues Contains anchor

TODO

 

check smtp submission

openssl s_client -connect mail.host.com:587 -starttls smtp -tls1_