[ Thanks to all of you for the previous help, BTW! ]

Let's try this with PAM now. Ignore the previous work
which ended up working (see messages last week).

What works: I can ssh into the server and get krb5 creds
(all PAM with sshd-gssapi entries).

What doesn't work: I had to enter a password, so ticket
forwarding is not working as expected.

I'm obviously trying to get a working solution here that
does not require any 3rd party workings to at least get
this far (yes, the 3rd party pam_afs_session will be used
at a later point to get AFS tokens from krb5 creds).

Client-side tickets were forwardable and the client-side
ssh command was:

/usr/bin/ssh -o "GSSAPIDelegateCredentials yes" -o
"GSSAPIAuthentication yes" alberta

== Log data ================================================== ====
....
debug1: Client offered gssapi userauth with { 1 2 840 113554 1 2 2 }
(supported)
debug1: Received delegated GSS credentials
PAM-KRB5 (acct): debug=1, nowarn=0
PAM-KRB5 (acct): no module data for KRB5_AUTOMIGRATE_DATA
PAM-KRB5 (acct): no module data
PAM-KRB5 (acct): end: Ignore module
PAM-KRB5 (setcred): start: nowarn = 0, flags = 0x1
PAM-KRB5 (setcred): kmd get failed, kmd=0x0
PAM-KRB5 (setcred): end: Can not retrieve user credentials
Failed gssapi-with-mic for jblaine from xxx.xx.11.213 port 36762 ssh2
....
# A few other failed gssapi-with-mic attempts here (labeled
# as unsupported)
....
debug1: Storing delegated GSS-API credentials
debug1: temporarily_use_uid: 26560/10 (e=0/0)

== sshd_config ================================================== =
....
GSSAPIAuthentication yes
GSSAPIKeyExchange yes
GSSAPIStoreDelegatedCredentials yes
....

== pam.conf ================================================== ====
sshd-gssapi auth requisite pam_authtok_get.so.1
sshd-gssapi auth required pam_dhkeys.so.1
sshd-gssapi auth sufficient pam_krb5.so.1 debug
sshd-gssapi auth required pam_unix_auth.so.1
sshd-gssapi account requisite pam_roles.so.1
sshd-gssapi account required pam_unix_account.so.1
sshd-gssapi account required pam_krb5.so.1 debug
sshd-gssapi session required pam_unix_session.so.1
sshd-gssapi session required pam_krb5.so.1 debug