ssh-keygen and slogin oddity

luke.kendall@cisra.canon.com.au luke.kendall@cisra.canon.com.au
Fri Sep 19 08:12:00 GMT 2003


I'm trying to make ssh ask me for a passphrase when I slogin to another
machine, instead of asking me for my password on that machine.  With no
luck.

It always asks me for my password.  If I modify /etc/ssh_config to set
password authentication to "no", then slogin simply fails without
asking me for anything.

Now, I used Cygwin's ssh-keygen (-t dsa) to generate a ~/.ssh/id_dsa
and .pub pair.  The id_dsa file starts off:

-----BEGIN DSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: DES-EDE3-CBC,A40CC4090416489F

Which generates this error in slogin:

: /home/luke ; slogin -v -v -v nevin
OpenSSH_3.6.1p1, SSH protocols 1.5/2.0, OpenSSL 0x0090702f
debug1: Reading configuration data /etc/ssh_config
debug1: Rhosts Authentication disabled, originating port will not be trusted.
debug2: ssh_connect: needpriv 0
debug1: Connecting to nevin [10.2.1.9] port 22.
debug1: Connection established.
debug1: identity file /home/luke/.ssh/identity type 0
debug1: identity file /home/luke/.ssh/id_rsa type -1
debug3: Not a RSA1 key file /home/luke/.ssh/id_dsa.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug2: key_type_from_name: unknown key type 'Proc-Type:'
debug3: key_read: missing keytype
debug2: key_type_from_name: unknown key type 'DEK-Info:'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: missing keytype
debug1: identity file /home/luke/.ssh/id_dsa type 2

But is that simply ssh trying to interpret id_dsa as an RSA key, giving
up, then trying to intrepret it as a DSA key?

Anyway, any idea why ssh won't ask me for my passphrase?

I discovered that you can't strace slogin, either.  Any idea how to
diagnose what's going on?

luke


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