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A complete beginners guide to SSLand SSL certificates. How they work and the different certificate types,encodings and uses. Root and intermediate certificates,chains and bundles.
Extract the PKCS#7 object:
$ openssl smime -verify -in file.msg -noverify -pk7out > file.pk7
Dump the certificates in that file
openssl pkcs7 -print_certs -in file.pk7 > file.pem
Open the file in your favorite text editor and seperate out each certificate individually in to it's own file and import:
For each CA certificate that you want to trust:
smime_keys add_root file.pem
Note: You do not need to trust all intermediate CAs. You can simply trust the end-user certificate.
For the subject certificate that you want to add:
smime_keys add_cert file.pem
The Common Name (also CN) identifies the host name associated with the certificate, for example www.example.com or example.com.
It consists of a single host name in case of a single-name certificate (e.g. example.com, www.example.com), or a wildcard name in case of a wildcard certificate (e.g. *.example.com). In all cases, it is not an URL and therefore it doesn’t include any protocol (e.g. http:// or https://), port number, or pathname.
M. Oltrogge, Y. Acar, S. Dechand, M. Smith, and S. Fahl. 24th USENIX Security Symposium (USENIX Security 15), page 239-254. Washington, D.C., USENIX Association, (August 2015)
V. Benjumea, S. Choi, J. Lopez, and M. Yung. Cryptology and Network Security, volume 4856 of Lecture Notes in Computer Science, page 265-281. Springer, (2007)