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options: Added an option to set server HostKey algorithms

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The added option SSH_BIND_OPTIONS_HOSTKEY_ALGORITHMS allows restricting
the signature algorithms to offer to the client for host authentication.
The list set is used as a filter of allowed algorithms.

First a list of possible signature algorithms to offer is created from
the keys set and then such list is filtered against the allowed
algorithms.

Signed-off-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>
This commit is contained in:
Anderson Toshiyuki Sasaki
2019-05-17 11:38:43 +02:00
committed by Andreas Schneider
parent 8f6e6f774e
commit 250a0be0f9
4 changed files with 161 additions and 64 deletions
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include/libssh/server.h
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@@ -54,6 +54,7 @@ enum ssh_bind_options_e {
SSH_BIND_OPTIONS_HMAC_S_C,
SSH_BIND_OPTIONS_CONFIG_DIR,
SSH_BIND_OPTIONS_PUBKEY_ACCEPTED_KEY_TYPES,
SSH_BIND_OPTIONS_HOSTKEY_ALGORITHMS,
};
typedef struct ssh_bind_struct* ssh_bind;