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When connecting to a server using ECDHE-based or DHE-based cipher suites, the s_client utility now reports the size of ECDHE and DHE parameters selected by the server. This allows for easy verification whether the used configuration set is secure.
I'm sorry but this is by no means a blocker. It should be at least submitted to upstream first for review.
The DH parameter size and ECDHE curve is determined by the server.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
http://rhn.redhat.com/errata/RHBA-2014-1525.html
Description of problem: When connecting to server using one of the ECDHE-* and DHE-* suites, openssl s_client utility doesn't report the size of parameters selected by server. This makes it hard to verify if the configuration set is secure. Version-Release number of selected component (if applicable): openssl-1.0.1e-15.el6.x86_64 How reproducible: Always Steps to Reproduce: 1. Run openssl s_server 2. Connect openssl s_client to it Alternatively: 1. openssl s_client -connect www.google.com:443 Actual results: New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES128-GCM-SHA256 Server public key is 2048 bit Secure Renegotiation IS supported Compression: NONE Expansion: NONE SSL-Session: Protocol : TLSv1.2 Cipher : ECDHE-RSA-AES128-GCM-SHA256 Session-ID: 8E883DD2A0476D7898F5A4485E1647760609D880D187EA9DD3481B93080CB629 Session-ID-ctx: Master-Key: C78ED7F083A6CB066729DCE229F754F6D5D38DA7B9326364E2F9F11F00C1557E2AD1D2543BF77A37E503A2E29AD5FEE9 Key-Arg : None Krb5 Principal: None PSK identity: None PSK identity hint: None TLS session ticket lifetime hint: 100800 (seconds) TLS session ticket: 0000 - 0a 12 64 19 5b 28 de 75-0b 4c 00 80 c9 ef 0b 60 ..d.[(.u.L.....` 0010 - 84 65 2f a4 db 28 8d 13-db ae 39 8b 2a d6 8c 71 .e/..(....9.*..q 0020 - 08 84 84 58 2f e6 f5 3f-24 07 00 52 5b d2 46 54 ...X/..?$..R[.FT 0030 - ba ac d6 0b d7 ae 1a 75-c8 ad 23 0f d2 d5 4b fa .......u..#...K. 0040 - cd 50 07 3f 9d 1c 57 b6-ea 8e c7 06 0c ed 9c 4b .P.?..W........K 0050 - 4a 68 2f 0a 6a b6 6e 13-92 c5 c8 07 aa 77 17 97 Jh/.j.n......w.. 0060 - 53 e8 8b 67 4a bb f3 a1-fb b8 9b 30 7f 79 c1 4f S..gJ......0.y.O 0070 - 47 c9 52 a2 5c 4d 93 33-dc 69 6c 5d 5c df 7c 2d G.R.\M.3.il]\.|- 0080 - 5a 55 0a 86 14 8a 20 82-0f b7 90 ae 6b 60 e4 a0 ZU.... .....k`.. 0090 - b2 0a ad 2b ...+ Start Time: 1390580593 Timeout : 300 (sec) Verify return code: 0 (ok) Expected results: ECDHE parameters size DHE parameters size in case of DHE suite Additional info: Needed for verification of bug 1057656, bug 1057687 and bug 1035818 with all suites supported by mod_ssl.