The easier way to get to this same result: ~$ openssl ecparam -genkey -name secp521r1 | openssl pkey -aes-256-cbc -passout pass:foobar
Deciding whether these parameters are safe is your job, I personally think secp521r1 is reasonably safe. Aki > On 20/02/2021 14:39 Antti Antinoja <rea...@fennosys.fi> wrote: > > > https://github.com/dovecot/core/blob/master/src/plugins/mail-crypt/test-mail-global-key.c > <- This test code has an encrypted private key included. > > After decoding this I learned that it looks different than the one we used. > > Dovecot test code key: > > -----BEGIN ENCRYPTED PRIVATE KEY----- > MIHeMEkGCSqGSIb3DQEFDTA8MBsGCSqGSIb3DQEFDDAOBAip6qJckQDOqwICCAAw > HQYJYIZIAWUDBAEqBBAW7OhPTeSLR8LKpf0f6GkvBIGQfNkaJhvs6UeVKdd7cstS > 1DR5rXMkN7OEmScM9cFY6P5k37gcUIPVnu4+91XeA5156rpiPJrpGdfzkr8O5Qjd > l1drrdzgHjdq8OefmDu0A324YwnRKxFDLTr9G2LU2HhbezkLcWQp1RHH6l5tQqKp > 6bwNb2w79xBoMXJ3z1VjpINfOpFrz3ynqYjQxly2+B86 > -----END ENCRYPTED PRIVATE KEY----- > > Our key: > > -----BEGIN EC PRIVATE KEY----- > Proc-Type: 4,ENCRYPTED > DEK-Info: AES-256-CTR,F7C4B1E7041D0A455B1F9E08046DA401 > > Pta8OAtA3ujv0vSMctiHiTd2j0GSSdzV57QGmUwCMMQp7QoqBHt/dDMEPbPF5lG1 > j0PDu5/FVuTtUlRZS16+NSWiorgkvVHTh3+47tx/uviQwQP/43tEaFpf77SAZlDw > xB2SjM4Zv1hdSpjxWDGGJFBDv/2/dj9UpTxwkAwuX+QQhRlVzSyr0BAXG9yOq/GT > ws8Q5GevzvHGh1YyPgpL9jtbizGIa4US0f7hEfGGHfJ/3RIdz0xeihv8Ga0huj48 > dS/QScE7Bv+Ymzzcg2dlvY96G5xRIOwB8ADwR/lwbw== > -----END EC PRIVATE KEY----- > > Compared these two keys to the examples at: > > * https://wiki.openssl.org/index.php/Command_Line_Elliptic_Curve_Operations > > ... and learned that mine was in encrypted 'EC specific' format whereas the > test key was in encrypted 'PKCS8' format. > > The solution was to convert our private key to pkcs8 format: > > cat private_key_encrypted.pem | base64 -d | \ > openssl pkcs8 -topk8 -v2 aes-256-cbc -v2prf hmacWithSHA256 | \ > base64 -w0 > private_key_encrypted_pkcs8.pem > > Do you think these parameters are safe? > > Cheers, > Antti > > On Sat, 20 Feb 2021 12:38:00 +0200 > Aki Tuomi <aki.tu...@open-xchange.com> wrote: > > > Can you tell us what you did differently? > > > > Aki > > > > On 20 February 2021 11.33.15 EET, Antti Antinoja <rea...@fennosys.fi> wrote: > > >Got it! My private test key was in wrong format. > > > > > >Cheers, > > >Antti > > > > > >On Sat, 20 Feb 2021 14:15:07 +0800 > > >Antti Antinoja <rea...@fennosys.fi> wrote: > > > > > >> Version: Dovecot 2.3.13 (89f716dc2) > > >> > > >> Issue: Dovecot states it can't parse the private key > > >> > > >> = Background = > > >> > > >> == Creating private EC key == > > >> > > >> * Curve: secp521r1 > > >> * Encryption: aes-256-ctr > > >> * Format: pkey > > >> * Enacapsulation: Base64 > > >> > > >> # openssl ecparam -name secp521r1 -genkey | openssl pkey |\ > > >> openssl ec -aes-256-ctr | base64 -w0 > > > >test_keys_remove/private_key_encrypted.pem > > >> > > >> == Extract public key == > > >> > > >> # cat test_keys_remove/private_key_encrypted.pem | base64 -d |\ > > >> openssl ec -pubout | base64 -w0 > test_keys_remove/public_key.pem > > >> > > >> == Checking keys == > > >> > > >> * 592 Feb 20 07:27 private_key_encrypted.pem: > > >> > > >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 > > >> > > >> * 360 Feb 20 07:28 public_key.pem: > > >> > > >LS0tLS1CRUdJTiBQVUJMSUMgS0VZLS0tLS0KTUlHYk1CQUdCeXFHU000OUFnRUdCU3VCQkFBakE0R0dBQVFBK2w2M0ZIckpuT0dPZ1lDTG5PRVpOaHpSdW5YWgpoMHd5dTNPS1VzSEozUDJPVWxNWmxKOFFjZTF0SExUTWFxMWxkOTIwbkdJQmo1TGNYUklVdWRweElTd0I2Tld0Ck1TWncrZFBEUVRjc0hQMFRqWUh5Njl4d25BZHV4ZHZYdnh0Uk5TRzZGNlJPUnR0L2t2ekk3bWRPM0NpQ1FyMTQKTjZWalZyYWVpaXZkR2dPQ250bz0KLS0tLS1FTkQgUFVCTElDIEtFWS0tLS0tCg== > > >> > > >> == Notes == > > >> > > >> * The keys are then saved in database and fetched to userdb by > > >Dovecot via passdb lookup (Details in the logs) > > >> * mail-crypt settings: > > >> > > >> mail_plugins = $mail_plugins mail_crypt > > >> plugin { > > >> mail_crypt_curve = secp521r1 > > >> mail_crypt_save_version = 0 > > >> } > > >> > > >> * Note: User record on database has mail_crypt_save_version = 2 as > > >can be seen from the log extract below. > > >> > > >> = Dovecot log on client IMAP message retrieval = > > >> > > >> Feb 20 07:45:01 pf1 dovecot[19612]: auth: Debug: > > >sql(te...@g1.fi,x.x.x.x,<wFzVEb67CMQKZgkb>): Performing passdb lookup > > >> Feb 20 07:45:02 pf1 dovecot[19612]: auth: Debug: > > >sql(te...@g1.fi,x.x.x.x,<wFzVEb67CMQKZgkb>): Finished passdb lookup > > >> Feb 20 07:45:02 pf1 dovecot[19612]: auth: Debug: > > >auth(te...@g1.fi,x.x.x.x,<wFzVEb67CMQKZgkb>): Auth request finished > > >> Feb 20 07:45:02 pf1 dovecot[19612]: auth: Debug: client passdb out: > > >OK 1 user=te...@g1.fi > > >> Feb 20 07:45:02 pf1 dovecot[19612]: auth: Debug: > > >sql(te...@g1.fi,x.x.x.x,<wFzVEb67CMQKZgkb>): Performing userdb lookup > > >> Feb 20 07:45:02 pf1 dovecot[19612]: auth: Debug: > > >sql(te...@g1.fi,x.x.x.x,<wFzVEb67CMQKZgkb>): Finished userdb lookup > > >> Feb 20 07:45:02 pf1 dovecot[19612]: auth: Debug: master userdb out: > > >USER 1609957377 te...@g1.fi > > >mail_crypt_global_private_password=key_pass_we_know_this_is_correct > > >mail_crypt_global_private_key=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 > > >mail_crypt_global_public_key=LS0tLS1CRUdJTiBQVUJMSUMgS0VZLS0tLS0KTUlHYk1CQUdCeXFHU000OUFnRUdCU3VCQkFBakE0R0dBQVFBK2w2M0ZIckpuT0dPZ1lDTG5PRVpOaHpSdW5YWgpoMHd5dTNPS1VzSEozUDJPVWxNWmxKOFFjZTF0SEx > > > UT > > >> > > >WFxMWxkOTIwbkdJQmo1TGNYUklVdWRweElTd0I2Tld0Ck1TWncrZFBEUVRjc0hQMFRqWUh5Njl4d25BZHV4ZHZYdnh0Uk5TRzZGNlJPUnR0L2t2ekk3bWRPM0NpQ1FyMTQKTjZWalZyYWVpaXZkR2dPQ250bz0KLS0tLS1FTkQgUFVCTElDIEtFWS0tLS0tCg== > > >mail_crypt_save_version=2 quota_rule=*:bytes=0 > > >home=/var/vmail/g1.fi/test1 uid=10000 gid=10000 > > >auth_mech=PLAIN auth_token=66d2d0f66bcce2758235fb53dbfe821804c6e79c > > >> Feb 20 07:45:02 pf1 dovecot[19612]: imap-login: Login: > > >user=<te...@g1.fi>, method=PLAIN, rip=x.x.x.x, lip=y.y,y,y, mpid=19618, > > >TLS, session=<wFzVEb67CMQKZgkb> > > >> Feb 20 07:45:02 pf1 dovecot[19612]: > > >imap(te...@g1.fi)<19618><wFzVEb67CMQKZgkb>: Debug: Added userdb > > >setting: > > >plugin/mail_crypt_global_private_key=LS0tLS1CRUdJTiBFQyBQUklWQVRFIEtFWS0tLS0tClByb2MtVHlwZTogNCxFTkNSWVBURUQKREVLLUluZm86IEFFUy0yNTYtQ1RSLEY3QzRCMUU3MDQxRDBBNDU1QjFGOUUwODA0NkRBNDAxCgpQdGE4T0F0QTN1anYwdlNNY3RpSGlUZDJqMEdTU2R6VjU3UUdtVXdDTU1RcDdRb3FCSHQvZERNRVBiUEY1bEcxCmowUER1NS9GVnVUdFVsUlpTMTYrTlNXaW9yZ2t2VkhUaDMrNDd0eC91dmlRd1FQLzQzdEVhRnBmNzdTQVpsRHcKeEIyU2pNNFp2MWhkU3BqeFdER0dKRkJEdi8yL2RqOVVwVHh3a0F3dVgrUVFoUmxWelN5cjBCQVhHOXlPcS9HVAp3czhRNUdldnp2SEdoMVl5UGdwTDlqdGJpekdJYTRVUzBmN2hFZkdHSGZKLzNSSWR6MHhlaWh2OEdhMGh1ajQ4CmRTL1FTY0U3QnYrWW16emNnMmRsdlk5Nkc1eFJJT3dCOEFEd1IvbHdidz09Ci0tLS0tRU5EIEVDIFBSSVZBVEUgS0VZLS0tLS0K > > >> Feb 20 07:45:02 pf1 dovecot[19612]: > > >imap(te...@g1.fi)<19618><wFzVEb67CMQKZgkb>: Debug: Added userdb > > >setting: plugin/mail_crypt_global_private_password=<hidden> > > >> Feb 20 07:45:02 pf1 dovecot[19612]: > > >imap(te...@g1.fi)<19618><wFzVEb67CMQKZgkb>: Debug: Added userdb > > >setting: > > >plugin/mail_crypt_global_public_key=LS0tLS1CRUdJTiBQVUJMSUMgS0VZLS0tLS0KTUlHYk1CQUdCeXFHU000OUFnRUdCU3VCQkFBakE0R0dBQVFBK2w2M0ZIckpuT0dPZ1lDTG5PRVpOaHpSdW5YWgpoMHd5dTNPS1VzSEozUDJPVWxNWmxKOFFjZTF0SExUTWFxMWxkOTIwbkdJQmo1TGNYUklVdWRweElTd0I2Tld0Ck1TWncrZFBEUVRjc0hQMFRqWUh5Njl4d25BZHV4ZHZYdnh0Uk5TRzZGNlJPUnR0L2t2ekk3bWRPM0NpQ1FyMTQKTjZWalZyYWVpaXZkR2dPQ250bz0KLS0tLS1FTkQgUFVCTElDIEtFWS0tLS0tCg== > > >> Feb 20 07:45:02 pf1 dovecot[19612]: > > >imap(te...@g1.fi)<19618><wFzVEb67CMQKZgkb>: Debug: Added userdb > > >setting: plugin/=2 > > >> Feb 20 07:45:02 pf1 dovecot[19612]: > > >imap(te...@g1.fi)<19618><wFzVEb67CMQKZgkb>: Debug: Added userdb > > >setting: plugin/quota_rule=*:bytes=0 > > >> Feb 20 07:45:02 pf1 dovecot[19612]: > > >imap(te...@g1.fi)<19618><wFzVEb67CMQKZgkb>: Error: mail_crypt_plugin: > > >mail_crypt_global_private_key: Couldn't parse private key: > > >Unknown/invalid PEM key type > > >> > > >> == Question == > > >> > > >> Any idea why Dovecot can't parse the private key? > > >> > > >> I tested this with several keys. Even with some without encryption -> > > >Always same error. > > >> > > >> According to the debug messages the private key is correctly loaded > > >(and indeed matches the one created on command line). > > >> > > >> Thank you for your time. > > >> > > >> Cheers, > > >> Antti > > >> > > >> -- > > >> Antti Antinoja <rea...@fennosys.fi> > > > > > > > > >-- > > >Antti Antinoja <rea...@fennosys.fi> > > > > -- > > Sent from my Android device with K-9 Mail. Please excuse my brevity. > > > -- > Antti Antinoja <rea...@fennosys.fi>