From 04961b439c6e863baa474fb3d7a0e3f6f4043f06 Mon Sep 17 00:00:00 2001
From: Hans Nilsson <hans@erlang.org>
Date: Fri, 8 Sep 2017 15:49:29 +0200
Subject: ssh: Make host key checking more debug friendly
---
lib/ssh/src/ssh_transport.erl | 31 +++++++++++++++++++++++--------
1 file changed, 23 insertions(+), 8 deletions(-)
diff --git a/lib/ssh/src/ssh_transport.erl b/lib/ssh/src/ssh_transport.erl
index 0052347912..46154cf536 100644
--- a/lib/ssh/src/ssh_transport.erl
+++ b/lib/ssh/src/ssh_transport.erl
@@ -824,6 +824,7 @@ verify_host_key(#ssh{algorithms=Alg}=SSH, PublicKey, Digest, {AlgStr,Signature})
end.
+%%% -> boolean() | {error,_}
accepted_host(Ssh, PeerName, Public, Opts) ->
case ?GET_OPT(silently_accept_hosts, Opts) of
@@ -845,11 +846,16 @@ accepted_host(Ssh, PeerName, Public, Opts) ->
%% Call-back alternatives: A user provided fun is called for the decision:
F when is_function(F,2) ->
- true == (catch F(PeerName, public_key:ssh_hostkey_fingerprint(Public)));
+ case catch F(PeerName, public_key:ssh_hostkey_fingerprint(Public)) of
+ true -> true;
+ _ -> {error, fingerprint_check_failed}
+ end;
{DigestAlg,F} when is_function(F,2) ->
- true == (catch F(PeerName, public_key:ssh_hostkey_fingerprint(DigestAlg,Public)))
-
+ case catch F(PeerName, public_key:ssh_hostkey_fingerprint(DigestAlg,Public)) of
+ true -> true;
+ _ -> {error, {fingerprint_check_failed,DigestAlg}}
+ end
end.
@@ -867,18 +873,27 @@ fmt_hostkey(X) -> X.
known_host_key(#ssh{opts = Opts, key_cb = {KeyCb,KeyCbOpts}, peer = {PeerName,_}} = Ssh,
Public, Alg) ->
UserOpts = ?GET_OPT(user_options, Opts),
- case KeyCb:is_host_key(Public, PeerName, Alg, [{key_cb_private,KeyCbOpts}|UserOpts]) of
- true ->
+ case is_host_key(KeyCb, Public, PeerName, Alg, [{key_cb_private,KeyCbOpts}|UserOpts]) of
+ {_,true} ->
ok;
- false ->
+ {_,false} ->
case accepted_host(Ssh, PeerName, Public, Opts) of
true ->
- KeyCb:add_host_key(PeerName, Public, [{key_cb_private,KeyCbOpts}|UserOpts]);
+ {_,R} = add_host_key(KeyCb, PeerName, Public, [{key_cb_private,KeyCbOpts}|UserOpts]),
+ R;
false ->
- {error, rejected}
+ {error, rejected_by_user};
+ {error,E} ->
+ {error,E}
end
end.
+is_host_key(KeyCb, Public, PeerName, Alg, Data) ->
+ {KeyCb, KeyCb:is_host_key(Public, PeerName, Alg, Data)}.
+
+add_host_key(KeyCb, PeerName, Public, Data) ->
+ {KeyCb, KeyCb:add_host_key(PeerName, Public, Data)}.
+
%% Each of the algorithm strings MUST be a comma-separated list of
%% algorithm names (see ''Algorithm Naming'' in [SSH-ARCH]). Each
--
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