[asterisk-dev] [Code Review] 4441: Enable TLS Dual-Certificates (ECC+RSA)

[Alexander Traud]

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https://reviewboard.asterisk.org/r/4441/
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Review request for Asterisk Developers.


Bugs: ASTERISK-24815
    https://issues.asterisk.org/jira/browse/ASTERISK-24815


Repository: Asterisk


Description
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Already works for Asterisk as the client. Enables dual- (or triple-) certificates for Asterisk as the TLS server. When a client connects via SSL/TLS, the server uses a RSA key-pair usually. However, more such algorithms exist like DSA and ECDSA. If you go for one of those, you would loose compatibility to RSA-only clients. This patch allows you to provide up-to one RSA, ECDSA and DSA key each (= one key or two keys or three keys). Copied over from the Apache HTTP server project, added in version 2.4.8.

Usage:
tlscertfile=/etc/asterisk/example_rsa.pem
Then, the code of this patch picks that path, filename, and searches for files called example_ecc.pem and example_dsa.pem automatically.


Diffs
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  trunk/main/tcptls.c 431938 

Diff: https://reviewboard.asterisk.org/r/4441/diff/


Testing
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by developer, manually

This patch was tested in Ubuntu 14.04 LTS with a certificate from Comodo (ECC; chains-up to AddTrust and UTN) and RapidSSL (RSA; chains-up to GeoTrust and Equifax). TLS clients were CounterPath Bria (BlackBerry) and CSipSimple (Android). The test was done with OpenSSL 1.0.1 and OpenSSL 1.0.2. Both versions work as expected. However, if you use well-known (commercial) certificates, you might use different certificate chains. For this, you need at least OpenSSL 1.0.2. If you use your own certificate authority without a certificate chain, OpenSSL 1.0.1 is sufficient.

Because no new symbol of OpenSSL was used, I do not see a reason why this patch should not be compatible with older OpenSSL releases. Therefore, no if/def/version is introduced in this patch.


Thanks,

Alexander Traud

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