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authorHans Nilsson <[email protected]>2016-11-11 16:59:08 +0100
committerHans Nilsson <[email protected]>2016-11-18 15:05:40 +0100
commit8215ea28fa2f699499b64d6f2c712e068b199390 (patch)
tree0941b1f929a56f3728a7bc6f3aad1abddbb370f7 /lib/ssh
parent01bd8ba71ce1f56ec9f8ef9de8a9f123076ed12a (diff)
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ssh: Add fun and fingerprint to option 'silently_accept_host'
Diffstat (limited to 'lib/ssh')
-rw-r--r--lib/ssh/doc/src/ssh.xml14
-rw-r--r--lib/ssh/src/ssh.erl9
-rw-r--r--lib/ssh/src/ssh_transport.erl16
3 files changed, 31 insertions, 8 deletions
diff --git a/lib/ssh/doc/src/ssh.xml b/lib/ssh/doc/src/ssh.xml
index ef9f7cbd9b..6b49f89449 100644
--- a/lib/ssh/doc/src/ssh.xml
+++ b/lib/ssh/doc/src/ssh.xml
@@ -175,11 +175,21 @@
supplied with this option.
</p>
</item>
- <tag><c><![CDATA[{silently_accept_hosts, boolean()}]]></c></tag>
+ <tag><c><![CDATA[{silently_accept_hosts, boolean() | accept_fun() | {crypto:digest_type(), accept_fun()} }]]></c>
+ <br/>
+ <c><![CDATA[accept_fun() :: fun(PeerName::string(), FingerPrint::string()) -> boolean()]]></c>
+ </tag>
<item>
<p>When <c>true</c>, hosts are added to the
file <c><![CDATA[known_hosts]]></c> without asking the user.
- Defaults to <c>false</c>.
+ Defaults to <c>false</c> which will give a user question on stdio of whether to accept or reject a previously
+ unseen host.</p>
+ <p>If the option value is has an <c>accept_fun()</c>, that fun will called with the arguments
+ <c>(PeerName, PeerHostKeyFingerPrint)</c>. The fingerprint is calculated on the Peer's Host Key with
+ <seealso marker="public_key:public_key#ssh_hostkey_fingerprint-1">public_key:ssh_hostkey_fingerprint/1</seealso>.
+ </p>
+ <p>If the <c>crypto:digest_type()</c> is present, the fingerprint is calculated with that digest type by the function
+ <seealso marker="public_key:public_key#ssh_hostkey_fingerprint-2">public_key:ssh_hostkey_fingerprint/2</seealso>.
</p>
</item>
<tag><c><![CDATA[{user_interaction, boolean()}]]></c></tag>
diff --git a/lib/ssh/src/ssh.erl b/lib/ssh/src/ssh.erl
index 1d7be3547b..31e343e81b 100644
--- a/lib/ssh/src/ssh.erl
+++ b/lib/ssh/src/ssh.erl
@@ -617,6 +617,15 @@ handle_ssh_option({user_dir_fun, Value} = Opt) when is_function(Value) ->
Opt;
handle_ssh_option({silently_accept_hosts, Value} = Opt) when is_boolean(Value) ->
Opt;
+handle_ssh_option({silently_accept_hosts, Value} = Opt) when is_function(Value,2) ->
+ Opt;
+handle_ssh_option({silently_accept_hosts, {DigestAlg,Value}} = Opt) when is_function(Value,2) ->
+ case lists:member(DigestAlg, [md5, sha, sha224, sha256, sha384, sha512]) of
+ true ->
+ Opt;
+ false ->
+ throw({error, {eoptions, Opt}})
+ end;
handle_ssh_option({user_interaction, Value} = Opt) when is_boolean(Value) ->
Opt;
handle_ssh_option({preferred_algorithms,[_|_]} = Opt) ->
diff --git a/lib/ssh/src/ssh_transport.erl b/lib/ssh/src/ssh_transport.erl
index 15b80de30a..21ba34506a 100644
--- a/lib/ssh/src/ssh_transport.erl
+++ b/lib/ssh/src/ssh_transport.erl
@@ -734,12 +734,16 @@ public_algo({#'ECPoint'{},{namedCurve,OID}}) ->
list_to_atom("ecdsa-sha2-" ++ binary_to_list(Curve)).
-accepted_host(Ssh, PeerName, Opts) ->
+accepted_host(Ssh, PeerName, Public, Opts) ->
case proplists:get_value(silently_accept_hosts, Opts, false) of
+ F when is_function(F,2) ->
+ true == (catch F(PeerName, public_key:ssh_hostkey_fingerprint(Public)));
+ {DigestAlg,F} when is_function(F,2) ->
+ true == (catch F(PeerName, public_key:ssh_hostkey_fingerprint(DigestAlg,Public)));
true ->
- yes;
+ true;
false ->
- yes_no(Ssh, "New host " ++ PeerName ++ " accept")
+ yes == yes_no(Ssh, "New host " ++ PeerName ++ " accept")
end.
known_host_key(#ssh{opts = Opts, key_cb = Mod, peer = Peer} = Ssh,
@@ -749,10 +753,10 @@ known_host_key(#ssh{opts = Opts, key_cb = Mod, peer = Peer} = Ssh,
true ->
ok;
false ->
- case accepted_host(Ssh, PeerName, Opts) of
- yes ->
+ case accepted_host(Ssh, PeerName, Public, Opts) of
+ true ->
Mod:add_host_key(PeerName, Public, Opts);
- no ->
+ false ->
{error, rejected}
end
end.